215 citations · 1k across the 21 of their papers we have counts for
5 papers · 2 filters
Breaking a modified substitution-diffusion image cipher based on chaotic standard and logistic maps
Chengqing Li, Shujun Li, Kwok-Tung Lo
Recently, an image encryption scheme based on chaotic standard and logistic maps was proposed by Patidar et al. It was later reported by Rhouma et al. that an equivalent secret key…
Optimal quantitative cryptanalysis of permutation-only multimedia ciphers against plaintext attacks
Chengqing Li, Kwok-Tung Lo
Recently, an image scrambling encryption algorithm of pixel bit based on chaos map was proposed. Considering the algorithm as a typical binary image scrambling/permutation algorith…
A Differential Cryptanalysis of Yen-Chen-Wu Multimedia Cryptography System (MCS)
Chengqing Li, Shujun Li, Kowk-Tung Lo +1
At ISCAS'2005, Yen et al. presented a new chaos-based cryptosystem for multimedia transmission named "Multimedia Cryptography System" (MCS). No cryptanalytic results have been repo…
Breaking a Chaotic Cryptographic Scheme Based on Composition Maps
Chengqing Li, David Arroyo, Kwok-Tung Lo
Recently, a chaotic cryptographic scheme based on composition maps was proposed. This paper studies the security of the scheme and reports the following findings: 1) the scheme can…
Breaking a new substitution-diffusion based image cipher using chaotic standard and logistic maps
Chengqing Li, Shujun Li, Kwok-Tung Lo
Recently, an image encryption scheme based on chaotic standard and logistic maps was proposed. This paper studies the security of the scheme and shows that it can be broken with on…