Finding New Differential Characteristics on SPECK Family

Rikuto KURAHARA; Kosei SAKAMOTO; Takanori ISOBE

doi:10.1587/transfun.2024EAL2077

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Finding New Differential Characteristics on SPECK Family

Rikuto KURAHARA, Kosei SAKAMOTO, Takanori ISOBE

著者情報

キーワード: Symmetric-key Cipher, SPECK, Differential Characteristics, SAT solver

ジャーナルフリー早期公開

論文ID: 2024EAL2077

DOI https://doi.org/10.1587/transfun.2024EAL2077

この記事には本公開記事があります。

The final version of this article is now available: Vol. E108.A (2025), No. 5 pp. 760-763

詳細

抄録

SPECK is a family of lightweight block ciphers. While Sun et al.'s evaluation of SPECK's differential characteristics was the most effective, it left room for further analysis over longer rounds. In this paper, we use a SAT-based search algorithm to analyze SPECK48, SPECK96, and SPECK128, presenting optimal differential characteristics up to 19, 15, and 11 rounds, respectively. We also explore the best characteristics up to 20 rounds for SPECK48, 18 rounds for SPECK96, and 20 rounds for SPECK128.

責任著者(Corresponding author)

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