Security of Related-Key Differential Attacks on TWINE, Revisited

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

doi:10.1587/transfun.2019CIL0004

Special Section on Cryptography and Information Security

Security of Related-Key Differential Attacks on TWINE, Revisited

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

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

JOURNAL RESTRICTED ACCESS

2020 Volume E103.A Issue 1 Pages 212-214

DOI https://doi.org/10.1587/transfun.2019CIL0004

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Abstract

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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