Security problems with a SC-CNN-based Chaotic Masking Secure Communication System

TL;DR

This paper analyzes the security vulnerabilities of a chaotic masking communication system based on SC-CNN and Chua circuit, revealing that plaintext can be retrieved with imperfect decoding and that the key space can be significantly reduced, compromising security.

Contribution

It demonstrates specific security flaws in a SC-CNN-based chaotic cryptosystem, including plaintext recovery with parameter mismatch and key space reduction, highlighting critical vulnerabilities.

Findings

Plaintext can be retrieved via ciphertext filtering with wrong receiver parameters.

The key space can be significantly reduced, facilitating brute force attacks.

System parameters can be precisely determined through decoding error analysis.

Abstract

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.