This paper studies the security of a chaotic cryptosystem based on the Chua circuit and implemented with State Controlled Cellular Neural Networks. It is shown that the plaintext can be retrieved by ciphertext band-pass filtering after an imperfect decoding with wrong receiver parameters. It is also shown that the key space of the system can be notably reduced easing a brute force attack. The system parameters were determined with high precision through the analysis of the decoding error produced by the mismatch between receiver and transmitter parameters.
Cite
@article{arxiv.0706.2979,
title = {Security problems with a SC-CNN-based Chaotic Masking Secure Communication System},
author = {A. B. Orue and G. Alvarez and F. Montoya and C. Sanchez-Avila},
journal= {arXiv preprint arXiv:0706.2979},
year = {2007}
}