Cryptology ePrint Archive: Report 2018/635

On linear hulls in one round of DES

Tomer Ashur and Raluca Posteuca

Abstract: At Indocrypt 2016, Ashur et al. showed that linear hulls are sometimes formed in a single round of a cipher (exemplifying on Simon ciphers) and showed that the success rate of an attack may be influenced by the quality of the estimation of one-round correlations. This paper improves the understanding regarding one-round linear hulls and trails, being dedicated to the study of one-round linear hulls of the DES cipher, more exactly of its $f$-function. It shows that, in the case of DES, the existence of one-round hulls is related to the number of active Sboxes and its correlation depends on a fixed set of key bits. All the ideas presented in this paper are followed by examples and are verified experimentally.

Category / Keywords: secret-key cryptography / DES, Linear Cryptanalysis, Linear Hulls,

Date: received 26 Jun 2018

Contact author: raluca posteuca at esat kuleuven be

Available format(s): PDF | BibTeX Citation

Version: 20180703:120925 (All versions of this report)

Short URL: ia.cr/2018/635


[ Cryptology ePrint archive ]