Keywords : Discrete Cosine Transform
journal of kerbala university,
2012, Volume 8, Issue 4, Pages 136-149
Selective encryption is a new trend in image and video content protection. It's aim to reduce the amount of data to protect while preserving a sufficient level of security by connected with chaotic theory. Due to their features of ergodicity, sensitivity to initial conditions, pseudo randomly, chaotic maps have good potential for information encryption. In this work, selective image encryption based on chaos algorithm has suggested, This technique adopted two main operations one to decorrelate the relationship between adjacent pixels of plain image which is based on 2D Chaotic Standard map and the other to decorrelate the relationship between the plain image and encrypted image which is based on 4D Chaotic Map. Experimental results show that the proposed scheme is computationally secure, it withstands different types of attacks such as brute force attack, differential attack, chosen-plaintext and chosen-ciphertext attacks. Also, Experimental results show that the proposed scheme is suitable for multimedia application with real time operation. Where the average execution time is (1 second) when the encryption ratio is equal to (6.25 %).