Return-Map Cryptanalysis Revisited

Shujun Li; Guanrong Chen; Gonzalo Álvarez

doi:10.1142/s0218127406015507

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Return-Map Cryptanalysis Revisited

Shujun Li·Guanrong Chen·Gonzalo Álvarez

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Abstract

As a powerful cryptanalysis tool, the method of return-map attacks can be used to extract secret messages masked by chaos in secure communication schemes. Recently, a simple defensive mechanism was presented to enhance the security of chaotic parameter modulation schemes against return-map attacks. Two techniques are combined in the proposed defensive mechanism: multistep parameter modulation and alternative driving of two different transmitter variables. This paper re-studies the security of this proposed defensive mechanism against return-map attacks, and points out that the security was much over-estimated in the original publication for both ciphertext-only attack and known/chosen-plaintext attacks. It is found that a deterministic relationship exists between the shape of the return map and the modulated parameter, and that such a relationship can be used to dramatically enhance return-map attacks thereby making them quite easy to break the defensive mechanism.

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Shujun Li, Guanrong Chen, Gonzalo Álvarez. 2006-08-27. Return-Map Cryptanalysis Revisited. https://doi.org/10.1142/s0218127406015507

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