215 citations · 673 across the 11 of their papers we have counts for
11 papers
Breaking an image encryption algorithm based on chaos
Chengqing Li, Michael Z. Q. Chen, Kwok-Tung Lo
Recently, a chaos-based image encryption algorithm called MCKBA (Modified Chaotic-Key Based Algorithm) was proposed. This paper analyzes the security of MCKBA and finds that it can…
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…
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…
Cryptanalysis of two chaotic encryption schemes based on circular bit shift and XOR operations
Chengqing Li, Shujun Li, Gonzalo Álvarez +2
Recently two encryption schemes were proposed by combining circular bit shift and XOR operations, under the control of a pseudorandom bit sequence (PRBS) generated from a chaotic s…