Security: Theoretical attacks better than exhaustive key search Serpent 28% 72 Twofish 38% 62 M ars 69% 31% Rijndael 70% 30% RC6 75 25 0102030405060708090100 of rounds in the attack/total of rounds.100%14 0 10 20 30 40 50 60 70 80 90 100 Twofish Serpent Rijndael RC6 Mars Security: Theoretical attacks better than exhaustive key search # of rounds in the attack/total # of rounds  100% 28% 72% 38% 62% 69% 31% 70% 30% 75% 25%