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Breaking a chaos-noise-based secure communication scheme

Shujun Li·Gonzalo Álvarez·Guanrong Chen·Xuanqin Mou
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Abstract

This paper studies the security of a secure communication scheme based on two discrete-time intermittently-chaotic systems synchronized via a common random driving signal. Some security defects of the scheme are revealed: 1) the key space can be remarkably reduced; 2) the decryption is insensitive to the mismatch of the secret key; 3) the key-generation process is insecure against known/chosen-plaintext attacks. The first two defects mean that the scheme is not secure enough against brute-force attacks, and the third one means that an attacker can easily break the cryptosystem by approximately estimating the secret key once he has a chance to access a fragment of the generated keystream. Yet it remains to be clarified if intermittent chaos could be used for designing secure chaotic cryptosystems.

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Shujun Li, Gonzalo Álvarez, Guanrong Chen, Xuanqin Mou. 2005-09-13. Breaking a chaos-noise-based secure communication scheme. https://doi.org/10.1063/1.1856711

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