A new dynamic DNA-coding model for gray-scale image encryption

Abstract To protect the images and provide a more secure cipher image, DNA encoding is crucial in image encryption. Applying single, easily detectable coding rule to during has no impact on encryption model's security level. Therefore, using various rules while applying dynamic DNA-coding techniques have emerged strengthen improve of its security. This study integrates method with an model. The model applied gray-scale images, where predetermined rule, every two bits are DNA-encoded image. proposed generates key by sending metadata hash functions. Following that, hyperchaotic system constructs three chaotic sequences key, Lorenz–Liu sequence rules. Then, passed Arnold Transform, resulted diffused five maps. Last, rules, it DNA-encoded, provided DNA, DNA-decoded. Twelve metrics were used assess ten widely images. Results show promising improvement performance, since enhanced