Image Encryption using a Modified Pseudo-Random Generator

This paper presents a new image encryption algorithm, that accepts an initial secret key and an initialization vector, to produce the encryption/decryption keys using a modified pseudo-random generator. This key is used to encrypt the input images using an XOR cipher. The mathematical inability of the attacker to determine the values of the seeds, due to their logical discreteness from the output of the pseudorandom generator, and thus the encryption algorithm, is the key feature that ensures the security of the algorithm. The proposed algorithm is used to encrypt the standard test images, and the obtained results are scrutinized with respect to the following metrics - histogram, correlation, entropy, NPCR, and UACI. Theoretical and experimental analyses are performed to justify the performance and security offered by the proposed algorithm.