Cryptology ePrint Archive: Report 2008/288

How to Launch A Birthday Attack Against DES

Zhengjun Cao

Abstract: We present a birthday attack against DES. It is entirely based on the relationship $L_{i+1}=R_{i}$ and the simple key schedule in DES. It requires about $2^{16}$ ciphertexts of the same $R_{16}$, encrypted by the same key $K$. We conjecture it has a computational complexity of $2^{48}$. Since the requirement for the birthday attack is more accessible than that for Differential cryptanalysis, Linear cryptanalysis or Davies' attack, it is of more practical significance.

Category / Keywords: secret-key cryptography /

Date: received 26 Jun 2008, last revised 18 Jul 2008

Contact author: caoamss at gmail com

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Version: 20080718:063143 (All versions of this report)

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