Cryptanalysis of dynamic look-up table based chaotic cryptosystems

Details Cryptanalysis of dynamic look-up table based chaotic cryptosystems Cryptanalysis of dynamic look-up table based chaotic cryptosystems

2003-11-20

arxiv.org/abs/nlin/0311043v1

Nonlinear Sciences

Chaotic Dynamics

12 pages, 0 figures, 6 tables, latex format

Scientific paper

10.1016/j.physleta.2004.04.018

In recent years many chaotic cryptosystems based on Baptista's seminal work have been proposed. We analyze the security of two of the newest and most interesting ones, which use a dynamically updated look-up table and also work as stream ciphers. We provide different attack techniques to recover the keystream used by the algorithms. The knowledge of this keystream provides the attacker with the same information as the key and thus the security is broken. We also show that the dependence on the plaintext, and not on the key, of the look-up table updating mechanism facilitates cryptanalysis.

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