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Title:
Linear and Partly-Pseudo-Linear Cryptanalysis of Reduced-Round SPARX Cipher
Authors: Sarah Alzakari, Poorvi Vora
Abstract:We propose a new cryptanalytic technique and key recovery attack for the Sparx cipher, Partly-Pseudo-Linear Cryptanalysis, a meet-in-the-middle attack combining linear and pseudo-linear approximations. We observe improvements over the linear hull attacks in the literature for Sparx 128/128 and 128/256. Additionally, we generate another attack for comparison purposes, using the Cho-Pieprzyk property for a fully-linear approximation and a corresponding key recovery attack. We observe improvements on the data complexity, bias, and number of recovered key bits, over all variants of Sparx, when compared to the use of only the Cho-Pieprzyk approximation.
ePrint: https://eprint.iacr.org/2020/978
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