Breaking a chaos-noise-based secure communication scheme

Details Breaking a chaos-noise-based secure communication scheme Breaking a chaos-noise-based secure communication scheme

2004-07-23

arxiv.org/abs/nlin/0407052v4

Chaos, vol. 15, no. 1, art. no. 013703, March 2005

Nonlinear Sciences

Chaotic Dynamics

RevTeX4, 11 pages, 15 figures

Scientific paper

10.1063/1.1856711

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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