Security Of Related-Key Differential Attacks On Twine, Revisited

Kosei Sakamoto,Kazuhiko Minematsu,Nao Shibata,Maki Shigeri,Hiroyasu Kubo,Yuki Funabiki,Takanori Isobe

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES（2020）

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摘要

In this paper, we revisit related-key security of TWINE block cipher with 80-bit and 128-bit keys. Using an MILP-aided automatic search algorithm, we point out the previous evaluation of TWINE with a 80-bit key is wrong, and give a corrected evaluation result. Besides, we show a first security evaluation of TWINE with a 128-bit key in the related-key setting, which was infeasible due to the high computation cost in the original proposal.

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关键词

block cipher, related-key security, active sbox, MILP

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