FeW: A Lightweight Block Cipher

Authors : Manoj KUMAR, Sk PAL, Anupama PANİGRAHİ

Pages : 58-73

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Publication Date : 2019-12-31

Article Type : Research Paper

Abstract :In this paper, we propose a new lightweight block cipher \textit{FeW} which encrypts plaintext in the blocks of 64-bit using 80/128 bits key to produce 64-bit ciphertext. We also propose a new structure namely \emph{Feistel-M structure} by admixture of Feistel and 4-branch  generalised Feistel structures. This new structure significantly contributes to enhance the security margins of our design against the basic cryptanalytic attacks like differential, linear and impossible differential attacks. Security analysis signifies that \emph{FeW} has enough security margins against these cryptanalytic attacks and it can resist any key recovery attack beyond 17 rounds with the complexity better than $ 2^{64} $.
Keywords : Feistel Structure, Generalised Feistel Structure, Lightweight Cryptography, Substitution Permutation Network