Power transmission line monitoring image security encryption and decryption method

The invention discloses a power transmission line monitoring image security encryption and decryption method. The encryption method comprises the following steps: dividing an image into multiple layers of images according to binary numbers of pixel points in the image to be encrypted, and generating Q element groups of each layer of image; generating Q matrixes b and row scrambling and column scrambling vectors of each matrix bj according to Q random sequences generated by adopting a one-dimensional chaotic mapping function and Q element groups of the layer of image; performing DNA coding, row scrambling and column scrambling processing on the bj based on row scrambling and column scrambling vectors to obtain a matrix bj ''; calculating a hash value of the image, and generating a key matrix of the image based on the hash value and the Q random sequences in combination with DNA coding; and performing DNA-level diffusion on the key matrix and the bj '''according to the DNA multiplication table, and performing D