215 citations · 1k across the 21 of their papers we have counts for
21 papers
Recovering the Block-wise Relationship in an Encryption-Then-Compression System
Chengqing Li, Sheng Liu
Joint encryption and compression is an ideal solution for protecting security and privacy of image data in a real scenario, e.g. storing them on an existing cloud-based service lik…
Recovering Sign Bits of DCT Coefficients in Digital Images as an Optimization Problem
Ruiyuan Lin, Sheng Liu, Jun Jiang +3
Recovering unknown, missing, damaged, distorted, or lost information in DCT coefficients is a common task in multiple applications of digital image processing, including image comp…
Network analysis of chaotic dynamics in fixed-precision digital domain
Chengqing Li, Jinhu Lu, Guanrong Chen
When implemented in the digital domain with time, space and value discretized in the binary form, many good dynamical properties of chaotic systems in continuous domain may be degr…
On the security defects of an image encryption scheme
Chengqing Li, Shujun Li, Muhammad Asim +3
This paper studies the security of a recently-proposed chaos-based image encryption scheme, and points out the following problems: 1) there exist a number of invalid keys and weak…
Breaking a chaotic image encryption algorithm based on perceptron model
Yu Zhang, Chengqing Li, Qin Li +2
Recently, a chaotic image encryption algorithm based on perceptron model was proposed. The present paper analyzes security of the algorithm and finds that the equivalent secret key…
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…