On the Security of the Yi-Tan-Siew Chaos-Based Cipher

Title: On the Security of the Yi-Tan-Siew Chaos-Based Cipher

Research Question: Can the Yi-Tan-Siew chaos-based cipher withstand cryptanalytic attacks?

Methodology: The researchers analyzed the Yi-Tan-Siew cipher by examining its key structure, encryption function, and the distribution of noise vectors. They used differential cryptanalysis, a common technique in cryptography, to attack the cipher.

Results: The researchers found several flaws in the cipher:

1. The sub-key β should not be part of the secret key because it doesn't contribute significantly to the cipher's security. 2. The sub-key K can be cancelled by a differential chosen-plaintext attack, meaning the entire key collapses to just two variables (α and γ). 3. The noise vectors used in the encryption function do not have a uniform distribution, which reduces the cipher's security. 4. The security of the cipher is independent of the use of the chaotic tent map, making the chaotic element irrelevant to the cipher's security.

Implications: These flaws mean that the Yi-Tan-Siew cipher is not secure and should not be used for protecting sensitive information. The researchers also emphasize the importance of cryptanalytic studies in evaluating the security of chaos-based ciphers.

Link to Article: https://arxiv.org/abs/0402054v1 Authors: arXiv ID: 0402054v1