A highly efficient color image encryption based on linear transformation using chaos theory and SHA-2.

Firdous, Amnah; ur Rehman, Aqeel; Saad Missen, Malik M.

An innovative and highly efficient color image encryption technique based on the concept of linear transformation is presented in this paper. A 24-bit color image is split into the channels called Red, Green, Blue and afterwards each channel is permuted via cyclic shift on rows and columns using chaotic sequences. For substitution, pseudo-random numbers are generated using chaotic maps, which are then build into pseudo-random matrices through Linear Transformations. These random matrices are bonded with permuted colored channel under Exclusive-OR (XOR) operation. The control parameters and initial conditions for chaotic maps are obtained from 256-bits hash value of the original image to avoid the chosen-plaintext attacks. The comparison of simulated results with existing algorithms has shown the proposed algorithm is better in encryption robustness and better in noise repulsion during transmission. The proposed technique is most suitable for real time applications due to better efficiency.

CHAOS theory; RANDOM matrices; FOOD color; IMAGE encryption; COLORS

Multimedia Tools & Applications, 2019, Vol 78, Issue 17, p24809

1380-7501

Academic Journal

10.1007/s11042-019-7623-3