An Image Encryption Algorithm Based on Knight´s Tour and Slip Encryption-Filter

A new image encryption algorithm is proposed in the paper. Its essential idea is that, firstly, we produce a knight´s tour matrix emended as slip encryption-filter template matrix; And then, we produce a knight´s tour matrix again with the same size of the image waiting for encryption as a knight´s tour slip matrix; Finally, we let the center of the slip encryption-filter template move along with the knight´s tour slip matrix to do convolvsion operation, and achieve the cipher image. Experimental results show that the algorithm has perfert encryption effect, high encryption efficiency, simplity to achieve, huge secret key space and high security.