Impossible Differentials in Twofish
Twofish Technical Report #5, October 5, 1999
ABSTRACT: We show how an impossible-differential attack, first applied to DEAL by Knudsen, can be applied to Twofish. This attack breaks six rounds of the 256-bit key version using 2256 steps; it cannot be extended to seven or more Twofish rounds.
Schneier.com is a personal website. Opinions expressed are not necessarily those of BT.