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Recursive Orthogonal Diffusion for Deeper Encryption of Color Images

Since the advent of the internet, we have got to witness various new inventions and advancements in the field of cyber security and privacy. Earlier, images which were difficult to be sent to the receiver now can be sent at the tap of a button. Hence, in this paper, an encryption algorithm for a colour image using DNA encoding and the chaotic sequence is proposed. As for images, the correlation is the major constraint which gives backdoor for the attackers. To weaken the correlation an adaptive diffusion algorithm using a tent map random number generator is proposed in the paper. These random numbers are used for selecting a reference row and column to carry out the diffusion process, chronologically. The process is carried out recursively until the required correlation is achieved. The suitability of the algorithm against statistical attack is validated through some metric analysis.