Cryptology ePrint Archive: Report 2019/1285

Full-Round Differential Attack on DoT Block Cipher

Manoj Kumar

Abstract: The lightweight encryption design DoT was published by Patil et al in 2019. It is based on SPN (substitution permutation network) structure. Its block and key size are 64-bit and 128-bit respectively. In this paper, we analyse the security of DoT against differential attack and present a series of differential distinguishers for full-round DOT. Our analysis proves that DoT we can be distinguished from a random permutation with probability equal to 2^62. Diffusion layer of DoT is a combination of byte shuffling, 8-P permutation, 32-bit word shuffling and circular shift operations. We analyse the security of DoT with and without 8-P permutation in its diffusion layer. Our results indicate that DoT provides better resistance to differential attack without using the 8-P permutation.

Category / Keywords: secret-key cryptography / Block Cipher, Lightweight Block Cipher, Differential Cryptanalysis, Branch-and-bound Algorithm

Date: received 5 Nov 2019

Contact author: manojkumar at sag drdo in

Available format(s): PDF | BibTeX Citation

Version: 20191107:101433 (All versions of this report)

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