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Title:
MILP Based Differential Attack on Round Reduced WARP
Authors: Manoj Kumar, Tarun Yadav
Abstract:WARP is proposed by S. Banik et al. in SAC 2020. It is a 128-bit lightweight block cipher with 128-bit key. WARP is based on the 32-nibble type-2 Generalised Feistel Network (GFN) structure. It uses a permutation over nibbles which is designed to optimize the security and efficiency. The designers have provided a lower bound for the number of differentially active S-boxes but the detailed differential characteristics are not provided. In this paper, we discuss the MILP based search technique and present the differential characteristics for the 18-round and 19-round WARP with probability of 2^(-122) and 2^(-132) respectively. We also present a key recovery attack on the 21-round WARP with data complexity of 2^(113 )chosen plaintexts. To the best of our knowledge, these detailed differential characteristics are presented for the first time and this is the first key recovery attack on the 21-round WARP.
ePrint: https://eprint.iacr.org/2020/1598
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