Technology of Information Security
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App. Res. of Comp. Printed Article
Vol. 38, 2021 No. 9
2825-2830

Impossible differential cryptanalysis of 21-round CRAFT

Shi Xinlei1a,1b
Liu Ya1a,1b,2a
Lu Haining2b
Wang Lingyun3
1. a. School of Optical-Electrical & Computer Engineering, b. Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science & Technology, Shanghai 200093, China
2. a. Dept. of Computer Science & Engineering, b. Dept. of Electronic & Electrical Enginee-ring, Shanghai Jiao Tong University, Shanghai 200240, China
3. Shanghai Viewsource Information Science & Technology Co. Ltd. , Shanghai 200241, China
DOI: 10.19734/j.issn.1001-3695.2020.11.0554

Abstract

CRAFT is a lightweight tweakable block cipher proposed in FSE 2019, which is suitable for the resource-constrained equipment with the small hardware area to protect information security. It adopts the128 bit key and 64 bit tweak to encrypt a 64 bit plaintext. The evaluation of its safety can provide a theoretical basis for future use. The paper researched the structural properties of CRAFT and the redundancy of its key schedule, and chose a 13-round impossible differential of CRAFT, which made full use of the linear relations of round subkeys. Appended three rounds and five rounds at its top and bottom, this paper proposed a 21-round impossible differential, which applied some techniques such as the precomputation tables, the differential enumeration and the key-dependent property. The time, data and memory complexities of the attack were 296.74 encryptions, 253.6 chosen plaintexts and 256.6 64 bit blocks, respectively. This impossible differential attack on reduced-round CRAFT was the lowest time complexity attack under the single-key and single-tweak model. This method relied on the linear correlation of the handle value tweakey schedule, which was helpful to further understand the design of CRAFT.

Foundation Support

“十三五”密码发展基金理论课题(MMJJ20180202)
上海市“科技创新行动计划”高新技术领域项目(19511103900)
闵行区中小企业技术创新计划资助项目(2018MH110)

Publish Information

DOI: 10.19734/j.issn.1001-3695.2020.11.0554
Publish at: Application Research of Computers Printed Article, Vol. 38, 2021 No. 9
Section: Technology of Information Security
Pages: 2825-2830
Serial Number: 1001-3695(2021)09-049-2825-06

Publish History

[2021-09-05] Printed Article

Cite This Article

石新蕾, 刘亚, 陆海宁, 等. 21轮CRAFT算法不可能差分分析 [J]. 计算机应用研究, 2021, 38 (9): 2825-2830. (Shi Xinlei, Liu Ya, Lu Haining, et al. Impossible differential cryptanalysis of 21-round CRAFT [J]. Application Research of Computers, 2021, 38 (9): 2825-2830. )

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  • Application Research of Computers Monthly Journal
  • Journal ID ISSN 1001-3695
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Application Research of Computers, founded in 1984, is an academic journal of computing technology sponsored by Sichuan Institute of Computer Sciences under the Science and Technology Department of Sichuan Province.

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