A RGB image encryption algorithm based on DNA encoding and chaos map

In this paper, a RGB image encryption algorithm based on DNA encoding combined with chaotic map is proposed aiming at characteristics of RGB image. The algorithm firstly carries out DNA encoding for R, G, B components of RGB image; then realizes the addition of R, G, B by DNA addition and carries out complement operation by using the DNA sequence matrix controlled by Logistic; three gray images are got after decoding; finally gets the encrypted RGB images by reconstructing R, G, B components which use image pixels disturbed by Logistic chaotic sequence. Simulation result shows that the proposed algorithm has a large secret key space and strong secret key sensitivity. Meanwhile, it can resist exhaustive attack, statistical attack, and thus it is suitable for RGB image encryption.

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► DNA encoding can transform mathematical problem into biological problem.
► DNA pseudo-operation eliminates the correlation of RGB image in the space domain.
► Chaotic sequences control the transformational method of DNA sequences.
► The proposed algorithm is suitable to encrypt RGB image.