Enterprise information image encryption method based on double scrambling and controlled DNA coding

The invention provides an enterprise information image encryption method based on double scrambling and controlled DNA coding, and the method comprises the steps: carrying out the SHA-256 algorithm processing of an image P, obtaining a secret key, and calculating two groups of initial parameters of a 3D chaotic system; respectively substituting the two groups of initial parameters into a 3D chaotic system for iteration to obtain a chaotic sequence; intercepting a sequence from a chaos sequence, and performing random spiral scrambling on the sub-blocks of the image P with the chaos sequence to obtain an image P1; intercepting a sequence from a chaotic sequence, and carrying out bit cross scrambling on the image P1 to obtain an image P2; according to a controlled DNA coding method, coding the image P2 and the chaotic sequence to obtain two DNA sequences; carrying out ciphertext feedback on the two DNA sequences; and decoding according to the DNA coding rule selected by the chaos sequence to obtain a ciphertext