Security of Related-Key Differential Attacks on TWINE, Revisited

Kosei SAKAMOTO  Kazuhiko MINEMATSU  Nao SHIBATA  Maki SHIGERI  Hiroyasu KUBO  Yuki FUNABIKI  Takanori ISOBE  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E103-A   No.1   pp.212-214
Publication Date: 2020/01/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.2019CIL0004
Type of Manuscript: Special Section LETTER (Special Section on Cryptography and Information Security)
Category: 
Keyword: 
block cipher,  related-key security,  active sbox,  MILP,  

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Summary: 
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.