Security analysis of Khudra: a lightweight block cipher for FPGAs

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• 作者：Yibin Dai and Shaozhen Chen
• 刊名：Security and Communication Networks
• 出版年：2016
• 出版时间：10 July 2016
• 年：2016
• 卷：9
• 期：10
• 页码：1173-1185
• 全文大小：852K
• ISSN：1939-0122

文摘

Khudra is a lightweight block cipher for field-programmable gate arrays, which appeared in SPACE 2014. In this paper, we consider the security of Khudra against the related-key attack. Firstly, we give some observations of F-function. Then we design a simple searching algorithm for related-key differential characteristics. By utilizing the observations and the searching algorithm, we launch related-key differential attacks on 16-round Khudra and full Khudra without whitening keys. Furthermore, we build a 13-round related-key rectangle distinguisher and attack on 16-round Khudra, which requires 2⁵³ chosen plaintexts and 2^64.08 encryptions. Moreover, with the 13-round distinguisher, there exists an attack on full Khudra without whitening keys. Then, we present a 14-round related-key impossible differential distinguisher. However, the 14-round distinguisher cannot work well, we propose a 11-round related-key impossible differential, which lead to an attack on 14-round Khudra without the pre-whitening keys. These results provide a helpful understanding of Khudra security evaluation against related-key attack. Copyright