Binary key based permutation for medical image encryption

The patient information such as x-rays, CTs and MRIs needs to protect from unauthorized access as per the HIPPA act. To provide better security for medical image novel encryption algorithm is proposed. In first phase, row wise, column wise and diagonal wise rotation is performed based on binary key provided. In second phase, four chaotic logistic maps are used to generate pseudorandom numbers which can work as a key to perform pixel value permutation to encrypt the image. Experimental analysis shows proposed technique does not provide any statistical information through histogram analysis. The correlation coefficient close to zero shows encrypted image is uncorrelated and NPCR and UACI values satisfy security requirement.