 Some other security researchers and journalists also dismissed the concept as implausible.Virtualization could be detected by a timing attack relying on external sources of time.In 2007, a group of researchers led by Thomas Ptacek of Matasano Security challenged Rutkowska to put Blue Pill against their rootkit detector software at that year's Black Hat conference, but the deal was deemed a no-go following Rutkowska's request for $384,000 in funding as a prerequisite for entering the competition.