Differential attack on nine rounds of the SEED block cipher
The SEED block cipher is an ISO international standard. We describe two 7-round differentials with a trivially larger probability than the best previously known one on SEED. We present a differential cryptanalysis attack on 9-round SEED. Our result is better than any previously published cryptanalytic results on SEED in terms of the numbers of attacked rounds. Our result suggests that the safety margin of SEED decreases below half of the number of rounds.
seed block cipher differential cryptanalysis cryptography cryptology