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Related-Key Attacks on Triple-DES and DESX Variants

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Topics in Cryptology – CT-RSA 2004 (CT-RSA 2004)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 2964))

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Abstract

In this paper, we present related-key slide attacks on 2-key and 3-key triple DES, and related-key differential and slide attacks on two variants of DESX. First, we show that 2-key and 3-key triple-DES are susceptible to related-key slide attacks. The only previously known such attacks are related-key differential attacks on 3-key triple-DES. Second, we present a related-key differential attack on DESX+, a variant of the DESX with its pre- and post-whitening XOR operations replaced with addition modulo 264. Our attack shows a counter-intuitive result, that DESX+ is weaker than DESX against a related-key attack. Third, we present the first known attacks on DES-EXE, another variant of DESX where the XOR operations and DES encryptions are interchanged. Further, our attacks show that DES-EXE is also weaker than DESX against a related-key attack. This work suggests that extreme care has to be taken when proposing variants of popular block ciphers, that it is not always newer variants that are more resistant to attacks.

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Author information

Authors and Affiliations

  1. Department of Engineering, Swinburne Sarawak Institute of Technology, 1st Floor, State Complex, 93576, Kuching, Malaysia

    Raphael C. -W. Phan

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  1. Raphael C. -W. Phan
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Editors and Affiliations

  1. NTT, 3-9-11 Midori-cho, Musashino-shi, 180-8585, Tokyo, Japan

    Tatsuaki Okamoto

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Phan, R.C.W. (2004). Related-Key Attacks on Triple-DES and DESX Variants. In: Okamoto, T. (eds) Topics in Cryptology – CT-RSA 2004. CT-RSA 2004. Lecture Notes in Computer Science, vol 2964. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-24660-2_2

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  • DOI: https://doi.org/10.1007/978-3-540-24660-2_2

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-20996-6

  • Online ISBN: 978-3-540-24660-2

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