Differential Cryptanalysis and Impossible Differential Characteristics of Extended Feistel Networks

Provided by: Science & Engineering Research Support soCiety (SERSC)
Topic: Security
Format: PDF
Impossible Differential Cryptanalysis (IDC) is a variant of Differential Cryptanalysis (DC) against block ciphers whereby impossible differential characteristics are used to retrieve a sub key material for the first or the last several rounds of block ciphers. Thus the security of a block cipher against IDC can be evaluated by impossible differential characteristics. In this paper, the authors will first examine the security of Extended Feistel Networks (EFNs) against DC and then use the U-method introduced in to find impossible differential characteristics of EFN.

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