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Paper 2020/1598

MILP Based Differential Attack on Round Reduced WARP

Manoj Kumar and 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 32-nibble type-2 Generalised Feistel Network (GFN). It uses permutation over nibbles designed to optimize the security and efficiency. Designers have provided a lower bound for the number of differentially active S-boxes but detailed differential characteristics are not provided. In this paper, we discuss MILP based search technique and present differential characteristics for 18-round and 19-round WARP with probability of $2^{-122}$ and $2^{-132}$ respectively. To the best of our knowledge, these detailed differential characteristics for WARP are presented for the first time.

Metadata
Available format(s)
PDF
Category
Secret-key cryptography
Publication info
Preprint. MINOR revision.
Keywords
Lightweight CryptographyBlock CipherDifferential CryptanalysisMILP
Contact author(s)
manojkumar @ sag drdo in,tarunyadav @ sag drdo in
History
2021-08-02: revised
2020-12-24: received
See all versions
Short URL
https://ia.cr/2020/1598
License
Creative Commons Attribution
CC BY
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