Performance Evaluation of Block based Image Encryption Algorithms

With the fast development of data exchange in electronic system, safety of information is becoming more important in data storage and transmits. Because of commonly using images in industrial practice, it is very important to protect the confidential data from unauthorized access. This paper suggests that image encryption and decryption process based on block based encryption. The algorithms consider here are zonal based image encryption and primitive root based image encryption. The zone based image encryption is working based on the principle of zonal transformation matrix, whereas primitive root based image encryption is based on the principle of primitive root theorem. The attribute considered for the comparative study are information entropy and average deviation analysis. Experimental results demonstrate that the zone based image encryption method provides effective performance compared to primitive root based encryption method.