[Resource Topic] 2022/1121: Practical Attacks on the Full-round FRIET

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Practical Attacks on the Full-round FRIET

Authors: Senpeng wang, Dengguo Feng, Bin Hu, Jie Guan, Tairong Shi


FRIET is a duplex-based authenticated encryption scheme proposed at EUROCRYPT 2020. It follows a novel design approach for built-in countermeasures against fault attacks. By a judicious choice of components, the designers propose the permutation FRIET-PC that can be used to build an authenticated encryption cipher denoted as FRIET-AE. And FRIET-AE provides a 128-bit security claim for integrity and confidentiality. In this paper, we research the propagation of differences and liner masks through the round function of FRIET-PC. For full-round FRIET-PC, we can construct a differential distinguisher whose probability is 1 and a linear distinguisher whose absolute value of correlation is 1. For the authenticated encryption cipher PRIET-AE, we use the differential distinguisher with probability 1 to construct a set consisting of valid tags and ciphertexts which are not created by legal users. This breaks FRIET-AE’s security claim for integrity and confidentiality. As far as we know, this is the first practical attack that threatens the security of FRIET-AE.

ePrint: https://eprint.iacr.org/2022/1121

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