Well, today we're going to be looking at a very cheery subject. Those of you who have been reading ahead, which I'd encourage you to read ahead. We're in chapter one here. We'll know that this is a very strong portion of Scripture. I chose to entitle this particular portion of our study in the book of Romans. God gave them up. And so we'll be looking at that in some detail in just a moment as we begin our study. So let's read beginning in Romans chapter one, verse 24. And I'll read to verse 32, the end of the chapter. Romans chapter one, beginning at verse 24, reading to verse 32. Paul writes, therefore, God also gave them up to uncleanness in the lusts of their hearts to dishonor their bodies among themselves. Who exchanged the truth of God for the lie and worshiped and served the creature rather than the creator who is blessed forever. Amen. For this reason, God gave them up to vile passions. For even their women exchanged the natural use for what is against nature. Likewise, also the men leaving the natural use of the woman burned in their lust for one another. Men with men committing what is shameful and receiving in themselves the penalty of their error, which was due. And even as they did not like to retain God in their knowledge, God gave them over to a debased mind to do those things which are not fitting.  They are whisperers, backbiter, haters of God, violent, proud, boasters, inventors of evil things, disobedient to parents, undiscerning, untrustworthy, unloving, unforgiving, unmerciful. In other words, they're junior hires who, knowing the righteous judgment of God, that those who practice such things are worthy of death. Not only do the same, but also approve of those who practice them. So we have a cheery, cheery section of scripture that we're going to be spending some time in today. Paul has been developing in Romans chapter 1 since verse 18, man's moral guilt before God. What he does in chapter 1 is he lists or outlines the sins of the Gentile nations. When we get into chapter 2, he's going to list the sins of Israel. And then in chapter 3, he's going to condemn both Jew and Gentile to be guilty before God under law, because both Jew and Gentile are not faithful to God. That's basically what he's doing. He's going to show that humanity, Jew and Gentile combined, is in rebellion against God. We'll be seeing that as we go through the conclusion of chapter 1 into chapter 2, and then when we move into chapter 3. You see, what Paul is developing is what we today call a systematic theology. A systematic theology is just a systematized way of putting information concerning things of God into understandable form. And so it basically gives to us insights concerning who God is and how God works amongst men. Systematic theology. And what he's doing here is developing that for us by starting out with man being corrupt before God. You know, in a time when people today even are saying, how come bad things happen to good people? Paul would be making the case that in reality there's no such thing as a truly good person. There's only been one who is truly good, and that's Jesus Christ. All the rest of sin falls short of the glory of God. And so he's pointing that out by developing his theology, first pointing to the fact that man is sinful. And that God actually reserves wrath for those who reject him. So Paul has been making it clear that man has made a determined effort to reject God. He showed us in verse 19 that God had given to man a conscience. A conscience speaks of an innate knowledge of good and bad behavior. And so he says, man internally has an ability to know that he has done wrong. And then he went on and he spoke concerning creation in verse 20. And he pointed out that the beauty and mystery of creation is intended to provide proof that there is a creator. As a matter of fact, when you read verse 20, let me show you this. In verse 20 it says, since the creation of the world, his invisible attributes are clearly seen being understood by the things that are made. Clearly seen being understood. So he's saying we have visible evidence, things that we physically witness that is internally processed, something that we mentally can perceive. So he's saying, seeing people do not see and though perceiving they still do not perceive. They don't know that they've done wrong and they see creation but reject the evidence. Well, they know they did wrong but it doesn't matter. They see creation and reject the evidence. And so in doing so what happens is they end up living in vanity which is the final result of rejecting God. Vanity, when you see it in the book of Ecclesiastes, it says vanity of vanity all is vanity. The word vanity is used multiple times through the twelve chapters of the book of Ecclesiastes. The writer Solomon who has tried everything is basically saying without God everything is futile. Everything is worthless. Everything has no real value. There's no real purpose without God. He said in Ecclesiastes 1.14, I have seen all the works that are done under the sun and indeed all is vanity and grasping for the wind. So his point is if you reject God and the evidence of God, if you reject that you end up living in futility. So Paul is saying that humanity has had enough evidence to show that there's a God. There's the reality of God but instead of giving God glory and the honor that is due to him, instead man he says has become idolaters. In verse 21 he makes it very clear that their thoughts became futile and as a result man created gods in order to worship. When he says that their thoughts became futile, that word futile speaks of that which is filled with evil. Which hearkens all the way back to Genesis chapter 6.5 where it says, Then the Lord saw that the wickedness of man was great in the earth and that every intent of the thoughts of his heart was only evil continually. And so the point he's making is man in rejecting God has given man himself over to basically just seeking pleasure. As a result verse 22 is they have pride. They have developed pride.  In rejecting God and becoming self-sufficient they reap the consequences. Jonah in chapter 2 verse 8 said this, Those who regard worthless idols forsake their own mercy. In other words in leaving the God who is the fountain of mercy they abandoned the measure of mercy that God had treasured up for them. And that's what happened when you regard worthless idols. So God's wisdom is far above the wisdom that's found in the world. And those who reject his wisdom do not end up living an exciting life but a tasteless one. Because they're constantly looking and we can speak and say amen to that. They are constantly looking. We have been that way. And trying to find pleasure in life through relationships or through degrees or through jobs or finances or whatever. And in rejecting God who gives to us an abundance of life and joy that's unimaginable and peace and hope and all of the things that we truly desire and would like to have we end up living a tasteless life. Everything is just a shade of gray and people think well if I buy this car or I get this house or I attain this degree or have this relationship most certainly then I'll be satisfied. But once we grab hold of that like Ecclesiastes said it's grasping the wind. It is temporary and it's not something you can hold on to. And so in leaving the Lord in his mercy we embrace idols and that's the point he's making. Now God's wisdom has been made manifest through the message of the Gospel. Now as already seen he made this very clear in verses 16 and 17. The Gospel is a message declaring the way of salvation to all who believe. But in spite of all the efforts that God has Paul would be making this case. In spite of all the efforts God has made towards saving us. Mankind habitually voluntarily rejects his invitation to them. It reminds me of Matthew 2337 where Jesus said, Oh Jerusalem Jerusalem the one who kills the prophets and stones those who are sent to her. How often I wanted to gather your children together as a hen gathers her chicks under her wings. But you were not willing. You were not willing. And so they reject creation. They reject conscience. They reject the message of the Gospel. And as a result they're left to their own pursuits and they turn to idolatry. The result of rejecting God is idolatry. It's the worship not stewardship of creation. We today have a movement that we're very familiar with. That is at its heart really giving a lot of honor to creation itself. And we have this tendency of doing so. We look at nature as being our mother nature. Many people refer to mother nature as if the earth birthed humanity. And there is this sense of animal life being equal to human life. And what happens is we've gotten to the point where we actually give more honor to creation than we do to the creator. And as a result of that it's just a simple form of idolatry. And I see that. I find it interesting how people put so much value on animals. I'll give you an example. If you're going to be building a dam we'll say and you discover that there's a darter fish in the way. There are some small endangered species. In spite of the fact that there are thousands upon thousands of people who need water because you have a fish inside of this small stream there will be no way that you're going to be able to build a dam because of a darter fish. People care more about whales than they do about human beings. There are more people who are rabid supporters of saving whales than there are those who are supporters of saving children. They are pro-animal life but anti-human life. And you see that all the time. And a lot of people have started looking at animals as being as important to them as human life. Oh, here I go. I told for a service I wouldn't say this second but I'm going to. I still have a third service that I won't say it in. That'll go over the air. I don't know how to put this. I say it first service and I clumsily said what I was thinking. So second service I will clumsily say the same thing. I revert to my hippie language so I'll say it like this. I trip out on how we do value animal life. I understand that dogs and cats are cute. I mean dogs especially cats. Well, anyway, I understand the dogs and all of that. I still am amazed as I see somebody walking their dog and that dog's got a sweater and booties on. I mean there is something wrong here. I don't get it. I don't get it. But I see it all the time.  And I trip on that. I say my goodness these people have really got a need. I understand I like animals myself. Especially steaks, dead ones that are cooked just right. I like animals. I'm an animal lover for sure. Some salt and salsa man, you can't beat those animals. They're great. Pigs, chickens, cows, they're all good. But it just kind of shows where we as a society have gone is we value certain things and overvalue certain things and all. It's just a way of... And I'm not saying everybody who loves their animal. See this is where I have to be careful. I'm not saying everybody who loves their animal and shows special attention to that animal is necessarily worship and creation. What I'm saying is there's a general tenor towards the value of the animal that is on par with human beings. Which is why you can see a commercial where they have this music in the background and something about whatever. I'm in pain and nobody loves me. And then they have a picture of a dog just looking into the camera, like the camera is saying please feed me. And the dog is just saying help me. And then people send their money to the SVCA or whatever. It's the same mentality where you see this woman feeding a cat food in crystal. Or where they say you've got to buy this special kind of food for your dog because you want the dog to eat the very best. And I'm saying those are the same animals that drink out of toilets. Are you kidding me? And yet that's what we do. That's what we do. We are enhancing in society's eyes the value of animals but we have undermined the value of children. Do you see that? I see that. And I say what an odd way of thinking. What happens when you... That's a logical thing that happens when you don't honor God and man who is created in the image of God. All things at that time become pretty much equal. And so if I think cats are better than babies then so be it. If I think whales are better than babies then so be it. That's my opinion. And who's going to argue with me about it? Well Paul would argue and he would say that man was created in the image of God. And that man has been given stewardship. We have the responsibility of stewarding but not worshiping creation. Man is God's crowning creation. He created all things with the spoken word but man he breathed his life into his soul. He created fashion man with his hands. So we have a deeper relationship with our creator than the spoken creation of let there be and then there was you see. Because when God created Adam the Bible says he formed him from the dust of the earth which is another way of saying that he showed personal interest into an actual crafting of the human being and then he breathed into him the breath of life. And when you look into that there are those rabbis as well as Christian conservative scholars who would say that word breath speaking of an intimacy can even be rephrased as kissed life into man which showed the relationship God had with man from creation and you don't see that in anything else. But man instead of stewarding creation changes to worshiping creation and that's what Paul is speaking about. And so man has chosen to become idolatrous. They've exchanged according to verse 23 changed or exchanged literally the glory of the incorruptible God for man, for birds, animals and for snakes. So what is God's response verse 24 therefore God also gave them up to uncleanness in the lust of their hearts to dishonor their bodies among themselves. God gave them up. That word gave gave them up that phrase speaks of abandoned. God abandoned them. This phrase is repeated with slight variation three times. It's mentioned here in verse 24, mentioned again in verse 26 and mentioned again in verse 28. It speaks of abandoning. What he's saying is when men persistently abandon God God will abandon them to their sin and the consequences of their sin. It's like Genesis chapter 6 verse 3 where it says the Lord said my spirit shall not strive with man forever for he is indeed flesh yet his days will be 120 years. God gave them up and brought judgment. Psalm 81 verses 11 and 12 but my people would not listen to me. Israel would not submit to me. So I gave them over to their stubborn hearts to follow their own devices. So God gave them up. What did he give them up to? Well verse 24 says God also gave them up to uncleanness in the lust of their heart. So the fruit of the rejection of God and idolatry is uncleanness. That word uncleanness speaks of lustful living. It speaks of impurity. He's saying man's rejection of God inevitably leads to a pursuit of personal pleasure. He speaks of the lust of their hearts. The heart has been referred to as the throne of sin in Matthew 15, 19 and 20. Jesus said out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies. These are the things which defile a man. The lust of the heart. The heart is the throne of sin. What did they do? Well verse 25 says who exchanged the truth of God for the lie and worshiped and served the creature rather than the creator who is blessed forever. Amen. Rejecting the truth that God has made known has serious consequences. Rejecting God's revelation. He's saying leads to idolatry which results in sexual sin. So in context, Paul would be speaking of the ritual prostitution rampant at his time but it was said that the physical experience was said to produce a mystical experience within one's own body. So the result of rejecting God is the dishonoring of their bodies amongst themselves. Man has mocked the honor of God by deifying the bodies of creatures and has built unto himself idols. God therefore abandons man to passions which dishonor his own body is what he's saying here. Their form of honor given to idols was expressed in sexual promiscuity and in rejecting God they believe the lie. When he says they have believed the lie it's the lie that there are other gods and other paths to salvation. Instead of giving God honor that is his due they give honor to idols. Idolatry in the Old Testament is the lie because it produces a false hope. In Jeremiah 10, 14 it reads everyone is dull-hearted without knowledge. Every metalsmith is put to shame by an image for his molded image is falsehood. There is no breath in them. So rather than worshiping the Creator who is God he's saying instead of doing that and yielding to God because God has given his witness through creation and conscience and has expressed it specifically through the message though they knew that there's a God they didn't retain God in their knowledge they basically tried God found him to be insufficient to meet their needs and thus turned to idols and idols in idolatry found its greatest expression in the mystical experience of having sexual intimacy.  That included all forms of sexual expression experienced outside of the marriage covenant. So when I say sexual expression outside of the marriage covenant there are obviously those who would argue for a moment and say or maybe for the rest of their life and say well what is wrong with experiencing sexual pleasure and not being married? Well the first thing is that God intends sexual satisfaction to be experienced within the covenant of marriage. God's design is found very clearly in scripture.  But somebody argues and says well why not live with someone to find out if we are compatible instead of marrying? I mean what happens if we get married and discover that we're not compatible why not give us an opportunity to discover that? There are those who are having relationships now living together that they liken to taking a test drive of a car before you buy it and so they basically look at relationships as being a trial, a test. It's not that relationships aren't a trial and it's not that marriages aren't a trial marriage can be a real trial but they're speaking in terms of a test drive if you will and so they argue that they see living together as a trial period. Well Rutgers professor David Pope no co-author to study on the result of cohabiting before marriage and found that those who live together before marriage are 48% more likely to divorce later Popano writes living together is not a good way to prepare for marriage or to avoid divorce. Cohabitants tend not to be as committed as married couples to the continuation of the relationship. The domestic violence rate for a woman who lives with a man outside of marriage is twice that of a married woman and so it's not a good idea to do that. Now concerning sexual purity God's word is abundantly clear concerning His will for us we're to present our bodies to the Lord for service and wait until we're married and it doesn't matter if you call the person your fiance God calls it fornication and God forbids it. In 1st Corinthians chapter 6 verse 13 Paul said the body is not meant for fornication but for the Lord and the Lord for the body. When Paul was writing to the Thessalonians in 1st Thessalonians 4 3 through 5 he said this God's will that you should be sanctified that you should avoid fornication that each of you should learn to control his own body in a way that is holy and honorable not in passionate lust like the heathen who do not know God. And so marriage is the proper place to express sexuality but they are bent on experiencing sex outside of it which he says is a form of idolatry. In verse 26 he says for this reason God gave them up to vile passions for even their women exchanged the natural use for what is against nature likewise also the men leaving the natural use of the woman burned in their lust for one another men with men committing what is shameful and receiving in themselves the penalty of their error which was due and they and even as they did not like to retain God in their knowledge God gave them over to a debased mind to do those things which are not fitting. Degrading passions that's what he's speaking of when he speaks of vile passions that speaks of the most disgraceful and repulsive of all passions and it's interesting that he's referring to lesbianism there and homosexuality. Notice in verse 26 how he says for even their women exchanged the natural use for what is against nature in this phrase natural use that's something that is produced by nature that which is inborn and agreeable to nature when he speaks of that which is against nature that's in opposition to the nature of things or which is natural the order of nature and what he's saying is homosexuality and lesbianism is against nature and natural instincts so he speaks of lesbianism in verse 27 he speaks of homosexuality the men leaving the natural use of burning in lust for one another this burning in lust speaks of an insatiable perverted lust and he says their commit what is shameful and receiving themselves a penalty of their error that word shameful has to be defined today it's been said that we now exist in a society that has forgotten how to blush and that's pretty true we live in a society that has forgotten what shame is because there are so many people who parade their sin openly that it has become pretty much welcome and accepted and even normal in the society that we live in and so people come out of the closet for a variety of perversions and things that are so shamefully wrong but they don't even know what the word shame means anymore many people don't even know what shameful speaks of or what the word shame means the word shame is a word that speaks of a painful feeling of humiliation caused by an awareness of wrong or foolish behavior and there are a lot of people who do not have that there is no shame they have no sense of I've done something wrong well in rejecting the lord in his mercies towards him they reap the eternal consequences by not repenting they never are going to be delivered from their burning lust nor find peace in Galatians 6 7 and 8 it says be not deceived God is not mock for whatever a man sows that shall he also reap for he who sows his flesh shall of the flesh reap corruption but he who sows to the spirit shall of the spirit reap life everlasting you see today these two sins that he actually began with lesbianism and homosexuality are presented as normal orientation it is presented as being a natural condition that somebody is born with but that simply is not verifiable through any unbiased scientific studies the young people going through school today here in the United States are being taught pretty much from the beginning from as early as kindergarten into first grade second grade that homosexuality lesbianism homosexuality is natural and inborn they are being taught that in one form or another those of you who have kids in school may very well be able to to say that that's true because that comes through in a variety of classes that begins very early to orient the kids and basically part of the reason was originally was because the teachers didn't want the students to be bullying other students and all but it's become pretty much the norm so that young people when you speak to young people today and some of you have when you speak to somebody 18, 19, 20 years old who came out of the educational system that we have here in California throughout the states lesbian or homosexual we're born that way they will tell you that they will argue that and they'll even go so far as to say that it's an inborn disposition but the fact is there is no way that you can prove that there is no such thing as a gay gene as far back as 1990 1995 Dr. Dean Hamer of the National Institutes of Health released the results of a two-year study Hamer a homosexual rights activist claimed that he had discovered a genetic component to homosexuality the media broadcast the study as proof of a gay gene the scientific community criticized the study for being flawed Hamer is reported to have said in a meeting of parents and friends of lesbians and gays if you tell the press what to write about a scientific study they will write it Dr. Alan Sanders of the NIH replicated Hamer's study in order to verify his conclusions Sanders could find no evidence to validate either Hamer's findings or his theory in 1948 Alfred C. Kinsey published a work stating that 10% of the U.S. population was homosexual experts have debunked his claim by pointing out that his data is flawed in that much of his work was done through interviewing sex offenders pimps, male prostitutes and those incarcerated in prison the midlife development in the United States study sponsored by the MacArthur Foundation found that only 2.5% of the 3032 American surveyed were either homosexual or bisexual and so all of this that you hear with people are saying that they were born that way and homosexuals are born that way lesbians are born that way is not verifiable by any evidence whatsoever the Bible presents homosexuality as a chosen lifestyle that results in judgment if not repented of rejecting God and God giving them over to the depravity of their desire the Bible presents it as a chosen lifestyle deserving of God's judgment Leviticus 1822 says you shall not lie with a male as with a woman it's an abomination though it is a sin and it is found to be sinful both in old and New Testament it is also forgivable and that's something we need to say in 1 Corinthians 6 9-11 it says do you not know that the unrighteous will not inherit the kingdom of God you should not be deceived neither fornicators nor idolaters nor adulterers nor homosexuals nor sodomites nor thieves nor covetous nor drunkards nor extortioners will inherit the kingdom of God and such were some of you but you were washed but you were sanctified but you were justified in the name of the Lord Jesus and by the spirit of our God but God will forgive those who repent the way that he has forgiven us of the sins that we have been committing and asked for his mercy and yet when Paul is speaking here he says listen God has given a message God has given witnesses an internal witness called the conscience an external witness called creation but man voluntarily rejects these witnesses rejects the gospel and thus God gives them over his message they've rejected he has given them over to a debased mind and what they have ended up doing is they've ended up worshiping creation rather than the creator who is God and blessed above all things the result of this is that their lifestyle demonstrates the rejection of God notice how he says in verse 28 even as they did not like to retain God in their knowledge God gave them over to a debased mind to do the things which is not fitting and he begins to tell us what all unrighteousness is sexual immorality wickedness, covetousness, maliciousness full of envy, murder strife, deceit evil mindedness their whisperers, backbiter haters of God violent, proud, boasters inventors of evil things disobedient to parents undiscerning untrustworthy, unloving unforgiving unmerciful who knowing the righteous judgment of God that those who practice such things are worthy of death not only do the same but also approve of those who practice them when he speaks of debased that's a word used of metals that were rejected because of impurities these metals were worthless and he says it has resulted in being filled with unrighteousness they're aware that there are such a thing as a judgment that's being preached that they don't care they even approve of those who do those things and that's the truth isn't it we usually give them Oscars or Grammys they become talk show hosts they're placed into positions of power we definitely not only approve of those things or practice them but we want them there because as a society because they simply reflect what we are ourselves that's how it works this is our mission field the gospel rightly preached has a power of transformation when the word of God is proclaimed and people receive in faith they can be forgiven that's why Paul said I am not ashamed of the gospel of Jesus Christ it is the power of God that's why he said that even though the world that we're living in is rejecting God they reject His word they reject their conscience they reject creation they give themselves over to things that they shouldn't do with no shame it doesn't mean that we should not be preaching the gospel because if I were to take a survey in this church and say how many in here have been guilty of the sins that were just read yes I've done that yes I've been there and yet look what the Lord has done through the gospel He's transformed our lives and so we should not allow ourselves to be argued by the world into a corner and feel that we are powerless because we of all people know the grace and mercy of God we at one time did those things ourselves therefore we're not the judge of this world there's only one judge what we are are ministers we are messengers of a gospel of transformation but Paul is making it very clear he is saying when you don't have a relationship with God this will be your life and you know that you are worthy of judgment so all Gentiles without God those who do not know God are entering into a time when they will be judged by God but what we do is we take a message of salvation and we proclaim it to people even if they don't want to hear I mean Noah was a preacher of righteousness his heart was touched by what was going on around him he proclaimed a message of coming judgment to the ridicule to his own ridicule and yet when the judgment came he his household were saved and that's what we're going to do we continue to take the word out even if people don't want to hear it we will speak it with confidence and courage because it's the truth and we will watch what God can do in people's life to embrace it that's what we've been called to do and God has a way of taking people and making them brand new so regardless of whether or not this was part of what their lifestyle was like that message of the gospel ultimately will reach and save people and that's why we preach the gospel but we are not Pollyanna's we don't look at our society saying it's a great society no our society is getting worse and worse it is a shameless society but the more shame and darkness that they have the more hope and light we should be giving to them may we live for Jesus Christ you can be set free by Jesus Christ He can transform your life if you embrace Him and He does change life isn't that the truth that is the truth He changes life


He has not lost a single game. I didn't say match up. No, I said a single game 30 over cursed 30 over dids 30 over June Dragoon 30 over too easy 30 over Turkey sucks three over To make his way here mighty unjust has had a great path as well 30 over Zescal and over violets and over wise Gemini 3 2 over D. Oh Nevertheless, he's here. Can she sub Raiden Syrax here in the winner's side Sub armor on oh Little bit of theirs unjust force off the breaker to how much meter have we got it only took a couple of seconds here With a little trying to be outside of that range exactly that spot right there It's gonna be a huge point of contention between these two Okay, it's been problematic for everyone the bullying pressure when's the lightning gonna come it is and can't you Unable to punish it probably from that range match up specific there You saw earlier a character like shout something really quick and far able to catch on the slower side with that sword again that range Dancing back and forth out of it is Ninja killer again. Okay committing more to the string this time is unjust Did the same range earlier with just the four to as well did you get some knockdown overhead? Overhead again Changes up. No Patience. Oh, hey, oh hold on. Maybe a chance Hit actually have saved them right there. See if I'm just gonna do something sent those down. He brings out the boy He's got a creep though. He's got a long way to creep. He's got a whole stage to creep Yes, if even it takes that don't even longer to get there. Oh, no Set that was still lingering. He was creeping Not long enough Man couple bars here. He's got Syrax as well Just to the corner I love that he does that he sacrifices a couple damage four corner carry definitely make a note of that. Oh Look at that two bars either Okay, he just built it. I Mean what he's doing is just building a lot of bar. Look at this If you look down at the bottom right right now, oh, yeah, that was legit He only had one bar moments ago.  No, he backs off actually rather than trying to chip sent to a game He's got a full stage to creep Game one goes to a totally unconcerned Ninja gala. That's great that he won the world championships with the same look on his face. Yeah. Yeah Emotionless Just very ready never out of his own head Just so focused. Yeah. Yeah, exactly His movement's been great as well. Yeah, he's in and out of the range we were talking about but on top of that on reaction He's shut down the ghost drop a couple of times for example Gorge Santa Crossover, okay, okay first real up close sento series the sandwich begins One loaf on the right one loaf on the left rated in trouble in the middle. Oh, man. I hope that sandwich Because oh my goodness Can you play the game though? Ninja, I think it's just kind of letting go of things doesn't want to come off any bar He did false walk in there and he gated a bunch of that chip See some straight sento From unjust where he doesn't have access to those spear specials just the sword says on hand me All unjust by I'm scared of things against the hit Oh, okay, I can really pump out some damage and just bullies them with the normals The cento stance wonderful round by mighty unjust. Yeah, sento stance still has some buttons in there Got some good tools all back and immediately denying the activation point on sento That's one of everything that I'm just does somewhere random given time back dash back to sub zero He threatened it there. Okay flies over punish Ninja killer in for some chip in for some meter building Know that you're expecting it. No one just ready for the staggers He says you're gonna come off that meter. You're gonna come off that Cyrax, and you're gonna give me my turn But you like it or not Did I close that gap on just plain hard to get right now? Oh That's gonna corner And bear me miss times. Yes. I can't come off it over it. Mm-hmm very tight I'm just trying to back dash, but there's nowhere to go Ninja harassing finally brings out cage And and that's the beauty of just not doing the kind of standard just string in the Cyrax string in the Cyra You know string in lightning cage really change it up Keep the meat in the middle. What's the big raiding in trouble low first time around. Yeah Gave ninja that much time Is he in time? Yes ninja unphase Meanwhile terrible things are happening to raid and he seems cool with it though That's right. He's got the emerald Can't really do a ghost trap. We've already seen ninja kill a get right past that He had no fear to just kind of walk into the range of that and do it confidence in the champ I'm gonna push back on that To to where most scenarios if you block a low poke He's gonna be able to check you with that for two then just doing it such good distances Yeah in the pushbacks to deny it Yeah, that's really a huge huge part of that of this matches. We've been saying That's like one third screen range in front of where Kenji is maybe half screen Who does it for a moment resetting a slightly ninja killer? He can get back in at any time But first Unjust will get things going back to start Simple sleeper comes down for trying to chase. He woke up swing it to Ninja killer patient. There's the borrow, but since I was gone My injustice. Thank you for spirits dance back No self the call And you know that immediately Another rising car. Oh, it's nice hits dagger right there Ice-fest on all right. Well the boys out Now he's just the blog he's frozen for a little while For a long time. Oh, no, that's taken up about a third of it happen He needs more he needs more he needs more Can he boy any chip? Oh Tanks it on the way forward with the electric fly And so ninja killer takes another game even the smile on just right there recognizing just just what could have happened right there the magic I'll be down to the wire again We mentioned it before but coming into this set ninja killer has not lost a game that continues probably the closest he has Been to losing a game Let's see if unjust could continue to sit down with my ex spirit charge because of all the meter though I started in letting go late in the blockchain like he did towards the end of the last round. Obviously just just missing flawless walk To avoid some of that chip. So I'm sorry there the ice shield not even there for Subs your heart to track you when you're moving forward with some of those normals of Kenshin Here we go. Oh There's the best friend.  Yeah Trying to chase oh escape is perfect I don't know how ninja is able to read what the puppet is gonna do as well as as his opponent He's not only in his opponents mind, but he's in it with his opponents puppets mind. That's insane But there's also knowledge knows all the options. Oh, yeah, sir Beautiful flawless block there. I'm just getting the timings down. Is this damage done? I So I'm Iran doesn't have to be worried about projectiles right now and doesn't want to test. Oh, okay It was either teleport or big I saw always like a push Yes The headbutt He's gonna have more work to do still in this round eight seconds on the clock Got a slight life lead. Oh Okay Steals a bit of a turn Ninja a full buck and it was perfectly executed the flawless box saved us Wow That is a tight timing right there that unjust knew exactly when Can't get any better than that And that is you know going back to talking about how you know different players from different eras are using mechanics Maybe a little bit better right out of the gate these MK 11 players and their flawless blocks have been so wonderful to see Again dancing outside of the 4-2 range ninja even here just standing in it So let's go ahead walk forward to get into the range of it and I'm a react. Yeah, he's ninja. So scary like that. He tests you Constantly look right with the range again. Sorry. Let's play Ninja just patient. He's got a huge life lead It doesn't need to move or take risks And again another late flawless block miss. I love how he knows all these last round It's like all these little few spoke conversions out of Cyrax that he's ready for any of the time false bug at first but it's not the second time and it is match point Ninja killer to get what seems like the faded winners finals with Fox really is they say they say choose your destiny I thought this was supposed to be a whole new timeline. Awkman. It was it was chosen for the same thing anyway Luke Hanks had slightly different story same ending No, you're right What do you mean Lord Luke Hanks, what do you mean by again swing it? Oh close shoulder for once. Okay Ninjas out of there Not not an aspect of subs here that you see an awful lot, but it's plus on blog. It's good. Yeah, it gives you breathing room It's a good reversal. Yeah, wait it out Unjust look Randy and Ascento and how many times have they gasp into each other and ninja finally It's had a button waiting for unjust this time around versus dashing block and wait a second. Oh, he's going for as much as he could right now 518 He did not get the timing and just like that setting up the winners finals between Ninja killer and Sonic Fox


Bonjour à tous, dans cette vidéo, je vais présenter un travail joint avec Stéphanie Delon et Mathieu Vavry sur les distinguations de Boomerang. Les distinguations de Boomerang ont été introduites par Wagner en 1999 et l'idée principale est de combiner deux différences courtes comme cela peut lead à une meilleure probabilité d'utiliser seulement une longue différence. Pour conclure la probabilité de l'objet de Boomerang, nous avons besoin d'une certaine assumption indépendante. Sinon, cette assumption n'est pas en pratique. On a trouvé plusieurs exemples de non-retour de Boomerang et les problèmes s'occupe à la junction de l'arrière et les choses différentes. Certaines attentes ont été faibles pour refaire la probabilité de Boomerang, mais en 2018, Sidette Hall a introduit le table de connectivité de Boomerang, BCT, comme une vue unifiée de tous les works prévus dans le domaine. C'est-à-dire que la BCT est seulement une précomputation de tous les possibles Boomerangs à une seule S-box. Et la définition de la BCT est ici sur le slide. Pour rechercher les caractéristiques de Boomerang, le procès original a été le premier à rechercher les caractéristiques de la meilleure différence sur le R1. Puis, on cherche les caractéristiques de la meilleure différence sur le R2, et on combine-les pour obtenir une caractéristique optimale de Boomerang sur le R1 et le R2. Depuis que l'on sait qu'on doit refaire la probabilité de la caractéristique de Boomerang, le procès n'a pas changé beaucoup. On cherche encore pour les caractéristiques de la meilleure différence sur le R1 et le R2, et on combine-les pour obtenir une caractéristique optimale de Boomerang. Le problème est que cette approche n'est pas optimale anymore, parce qu'il n'est pas clair que les caractéristiques optimales de Boomerang vont être les caractéristiques optimales de Boomerang. C'est pourquoi on a commencé ce travail. Et en fait, notre main idée était de chercher les caractéristiques de Boomerang directement, sans chercher les caractéristiques différentes. Nous proposons une nouvelle approche de 3-step pour chercher les meilleures caractéristiques de Boomerang. Le premier, nous proposons un modèle MILP pour chercher les caractéristiques de Boomerang. Ensuite, nous utilisons un modèle CP, un modèle de programmation contrainte pour chercher les meilleures caractéristiques de Boomerang. Donc, si nous combinons le premier et le second step, nous obtenons un processus pour chercher les meilleures caractéristiques de Boomerang. Et ensuite, nous avons un troisième step, dans lequel nous allons préciser les probabilités de la caractéristique de Boomerang et de la compétition de la caractéristique de Boomerang. Ce travail est dédié à Skinny, mais il est très adaptable à plusieurs autres caractéristiques. Pourquoi Skinny ? Skinny est un block cipher très facile. Le métier de la caractéristique de Boomerang est une caractéristique de Boomerang, qui simplifie beaucoup le constrain de correspondance pour des transitions valides dans le métier de la caractéristique de Boomerang. La caractéristique de Twiki est linéaire, qui aussi simplifie beaucoup tous les modèles. Et tous les modèles de la caractéristique de Boomerang et de la caractéristique de Boomerang, contiennent beaucoup de valeurs différentes, qui sont très intéressantes pour les techniques de la caractéristique de Boomerang. Donc, ce sont les résultats que nous avons obtenus contre les valeurs de Skinny. Comme vous pouvez le voir, nous avons obtenu beaucoup de nouveaux résultats, beaucoup de nouvelles caractéristiques de Boomerang. Et en particulier, nous avons approuvé tous les prévus works. Et par exemple, si vous regardez cette ligne particulière de cette table, pour 18 rounds de Skinny 128 dans le TK2, la probabilité de la meilleure caractéristique de Boomerang, c'est le 47, le minus 47, ce qui est le 30x mieux que la probabilité de la meilleure caractéristique de Boomerang. Donc, comment avons-nous obtenu tous ces résultats ? First, to search for the best Boomerangs, we need to be able to precisely compute the probability of a Boomerang characteristic. And to do that, the BCT is not enough. We need much more differential tables. In particular, we need three extra tables, the UBCT for upper BCT, the LBCT for lower BCT, and the EBCT for extended BCT. All those tables correspond to one particular case and depends on which differences are set to specific values and which differences are free. So both the UBCT and LBCT were already introduced in previous works. Sometimes they had different names. For instance, they are also called BDT and BDT prime. Regarding the EBCT, it is mostly new and it was only proposed as a future work by Mini et Al. So once we have all those differential tables, it is actually quite easy to compute the probability of a particular Boomerang characteristic. All we need to do that is to look at whether at which differences are set to specific values and which differences are free and which differences are set to zero. That's all. So for instance, for this particular S-Box, regarding the upper trail, both the differences at the input and the output of the S-Box are set to specific values. And for the lower trail, both differences are zero. So in that case, it corresponds to a DDT and the probability of this transition is only the probability of the transition D to 2 through the S-Box. But if we look for instance at this particular S-Box, now as before, so both differences at the input and the output of the S-Box in the upper trail are set to specific values. But this time in the lower trail, the difference at the input of the S-Box is also set to a specific value et the difference at the output of the S-Box is free. In that case, it corresponds to a UBCT and so we look at the corresponding probability in the UBCT table. So what is very important here is that knowing which table will be used for the probability computation only depends on few parameters. First, we need to know whether differences are set to specific values or not, or if they are free. And if they are set to specific value, then we need to know whether this value is zero or if it's a non-zero value. And that's all what we need to know which table will be used in the computation of the probability. So this help us to derive a new model to search for tranchated boomerang characteristics where basically we just use classical MILP model to search for tranchated differential characteristics. We copy it twice, one for the upper trail and one for the lower trail. And we add extra variables. So for each S-Box, we will add extra variables to know whether the difference is controlled or if it is free. And that's all. And then it's quite similar to a search of tranchated differential characteristics. So obviously we added some specific constraints for those new variables, for those controlled variables. And we added also specific constraints to know in which table will be used in the computation of the probability. And while for the search of tranchated characteristics we count the number of active S-Boxes, here it's quite the same, but instead of counting the number of active S-Boxes we will count how many DDT are involved, how many BCT are involved, how many EBCT are involved and so on. And so we have something very similar. So the objective is just this number of different tables weighted by the maximum probability exponent of each of those tables. An important property of this MILP model is that we did not define any middle round and actually both the lower and the upper trails are on the wall cipher. So there is no middle rounds, they are spread over all the ciphers in theory. And to show that this model is very generic we found that in some cases it automatically switches to the search of differential characteristics by setting for instance the lower trail to zero. So all difference are null in the lower trail. And in that case it automatically switches to differential characteristics, to tranchated differential characteristics. So that's our MILP model to search for tranchated boomerang characteristics. We can apply it to skinny so we didn't apply it directly to skinny before we made some simplifications. So in particular we found that for the DDT, the UBCT, the LBCT and the EBCT they all have the same probability of optimal transition. And so basically we just group them, all of them into one table to simplify the corresponding constraints. We also used the Queen-McCuskey algorithm to reduce the number of inequalities and it help us a bit. So as a result we obtain this table. So how to read that? Actually it's quite similar to the case of tranchated differential characteristics. So basically here it's the number of tables involved in boomerangs. And for instance this 40 here means that in the TK3 model the best boomerang characteristic on 24 rounds has a probability at most equals to the minus 80. So it's very similar to the search of tranchated differential characteristics. So now that we were able to compute tranchated boomerang characteristics we used a constraint programming model to find the best instantiation of them. So basically this model is highly inspired by the works we made with Minier and Charles Prudhomme and Victor Molimard which was published at ACNS 21 and actually in this work we found that a CP model was much faster than a MILP model to instantiate differential characteristics. This is because the DDT is highly non linear so using linear constraint to describe it is very complicated to lead to inefficient model. While in constraint programming model we can directly use what is called a constraint table in which we can directly set all the possible tuples for any operations. And so we used this model to instantiate many of the tranchated boomerang characteristics we found in the first step during the first step. Since this model was very fast was very efficient what we did was to start clustering with this model. So first we searched for all optimal instantiation of tranchated boomerangs and then for each of them we kept the input, the output and the difference on the key and we searched for extra instantiation with the same input, output and difference on the key. Of course we added some time limit and we also added some extra constraint on the probability of those new instantiation so they should not be too far away from the optimal probabilities but we start clustering using this CP model and this allowed us to identify interesting boomerang distinguishers and now for each of them we performed a very precise probability computation so a very precise cluster analysis so given a boomerang characteristic as in this example we can erase all intermediate differences and just replace them with variables and compute the probability of the distinguisher as a sum of the probability of all the possible boomerang characteristics Unfortunately this sum is quite big and we cannot compute it directly so what we first did was to propose a new algorithm based on dynamic programming to reorder the formula in such a way so the depth of the formula is the lowest possible so here you can see that to compute the formula I will have to guess at most 5 variables each time Unfortunately this was not always enough to precisely compute the formula and we had to perform some manual steps to approximate the formula so for instance when we have some like here maybe we can replace it by a BCT like say this is free or sometime we will just force some value for intermediate differences so we had to to make approximations on the formula because it was not always possible to compute them exactly but still we obtained very good results as already mentioned so some of of those boomerangs distinguishers have a high enough probability so we can try it in practice and we did that so we ran experiments to compare the actual probability of those boomerangs compared to what we predicted et as you can see for some of the boomerangs it's quite close but for some of them it's a bit it's not that close here there is a difference of 2 to the 8 2 to the 3 so 8 and we believe this is because in all our computations we assume that both sides of the boomerangs follow the same differential characteristics while in practice they only have to follow the same differential so this may explain the difference between the observed probability and the expected probability so to conclude in this work we propose a new combined pccp ad hoc approach to search for boomerangs distinguishers and we obtain many new results on the block cipher scheme there are still open problems regarding this work so first our MILP model generates a lot of redundant solutions meaning solutions that will lead to the exact same boomerangs distinguishers so the MILP model could be improved I also told you that we only considered the case where the same differential characteristics is used on both sides of the boomerangs and we add to use some approximations to evaluate the probabilities so all the source codes of all our different algorithms and models are available at this URL and we also have all the experiments we made there are also pdf with all the figures of all the boomerang distinguishers and if you have any question you can send me an email if you have some trouble to make it work ok, thank you for your attention