Security Proofs for Key-Alternating Ciphers with Non-Independent Round Permutations

ePrint Report: Security Proofs for Key-Alternating Ciphers with Non-Independent Round Permutations

Liqing Yu, Yusai Wu, Yu Yu, Zhenfu Cao, Xiaolei Dong

This work studies the key-alternating ciphers (KACs) whose round permutations are not necessarily independent. We revisit existing security proofs for key-alternating ciphers with a single permutation (KACSPs), and extend their method to an arbitrary number of rounds. In particular, we propose new techniques that can significantly simplify the proofs, and also remove two unnatural restrictions in the known security …

ciphers eprint report key non report security single studies the key work