2017/01/11 by Mohammed Alsaedi, Alsaedi, Mohammed
Computer Science · Physics and Astronomy · #Cellular Automata and Applications #Chaos control and synchronization #Chaos-based Image/Signal Encryption #Cryptography and Security (cs.CR) #FOS: Computer and information sciences
paper · pdf · doi:10.48550/arxiv.1701.02896
openalex publication_date 2017/01/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, a scheme for the encryption and decryption of colored images by using the Lorenz system and the discrete cosine transform in two dimensions (DCT2) is proposed. Although chaos is random, it has deterministic features that can be used for encryption; further, the same sequences can be produced at the transmitter and receiver under the same initial conditions. Another property of DCT2 is that the energy is concentrated in some elements of the coefficients. These two properties are used to efficiently encrypt and recover the image at the receiver by using three different keys with three different predefined number of shifts for each instance of key usage. Simulation results and statistical analysis show that the scheme high performance in weakening the correlation between the pixels of the image that resulted from the inverse of highest energy values of DCT2 that form 99.9 % of the energy as well as those of the difference image.