Information Security and Cryptology — ICISC 2002

Volume 2587 of the series Lecture Notes in Computer Science pp 138-148


Sliding Properties of the DES Key Schedule and Potential Extensions to the Slide Attacks

  • Raphael Chung-Wei PhanAffiliated withSwinburne Sarawak Institute of Technology
  • , Soichi FuruyaAffiliated withSystems Development Lab, Hitachi, Ltd.

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The DES key schedule is linear and yet defeats related-key cryptanalysis and other attacks that exploit weaknesses in key schedules, for example the slide attacks. In this paper we present new interesting key-pairs of the DES that can be used in related-key attacks to produce sliding properties of the full-round DES key schedule. This is a sort of key schedule weakness from a slide attack point of view. Our results demonstrate the first known sliding property of the original DES key schedule for its full 16 rounds. Finally, we consider potential applications of these findings in extending the slide attacks.


Block ciphers cryptanalysis DES key schedule extended slide attacks sliding property