Chosen-key attacks on a block cipher
Cryptologia
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In this article, we present improved related-key attacks on the original DESX, and DESX+, a variant of the DESX with its pre-and post-whitening XOR operations replaced with addition modulo 264. Compared to previous results, our attack on DESX has reduced text complexity, while our best attack on DESX+ eliminates the memory requirements at the same processing complexity.