Some of the remaining mysteries include why the S-
Some of the remaining mysteries include why the S-boxes are highly resistant to linear analysis but vulnerable to differential analysis, why there are exactly 16 rounds, and why the key length was chosen to be 56 bits. Many suspect the NSA of inserting a trapdoor into the design but no significant weakness has ever been found in this most popular symmetric cipher. For 10 points, name this standard algorithm.
Some of the remaining mysteries include why the S-boxes are highly resistant to linear analysis but vulnerable to differential analysis, why there are exactly 16 rounds, and why the key length was chosen to be 56 bits.