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A related key attack on the feistel type block ciphers

Bagherzandi, A ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. Publisher: Femto Technique Co., Ltd , 2009
  3. Abstract:
  4. In this paper we show that Biham's chosen key attack can be generalized to include any block cipher and we give a low complexity chosen key attack on any Feistel type ci-pher. Then we show that the irregularities in the shift pattern of DES key schedule algorithm is not sufficient for the cryptosystem to resist against related key attacks. We have realized our proposition by a counter example in which the E-box of DES is slightly modified whiles other components and among those, the shift pattern in key schedule algorithm is kept unchanged. We have ap-plied a new related key attack on the resulting DES-like cryptosystem and demonstrated that the security of the system decreases drastically
  5. Keywords:
  6. Chosen key attack ; Differential related key at-tack ; Security of data ; Counter examples ; Des ; Feistel type block ciphers ; Feistel type cipher ; Key attack ; Related key attacks ; Related keys ; Schedule algorithms ; Cryptography
  7. Source: International Journal of Network Security ; Volume 8, Issue 3 , 2009 , Pages 221-226 ; 1816353X (ISSN)
  8. URL: https://pdfs.semanticscholar.org/216c/f952a368d45d013818d6c2a16de6ddd8afde.pdf