AN IMPROVED COLOR IMAGE ENCRYPTION ALGORITHM WITH PIXEL PERMUTATION AND BIT SUBSTITUTION

Lini Abraham, Neenu Daniel

Abstract: Today the transmission of multimedia data including image and video is growing in telecommunications. Security is one of the main issues in transferring such sensitive information. Powerful image encryption algorithm is the solution for this problem. This paper is an implementation of a color image encryption algorithm based on Rubik’s cube technique. The Rubik’s cube technique is used for pixel permutation and a bit substitution method based on DNA sequences are used to change the value of each pixel on the image. Then the time-stamp is appended with encrypted image, which can be used to identify the replay attack. For evaluating the performance of the algorithm a series of tests are performed. These tests include information entropy analysis, correlation analysis, analysis of NPCR and UACI values etc.

Keywords: Cryptography, encryption, decryption, timestamp, replay attack, plaintext, cipher-text, algorithm, chaos

DOI: https://doi.org/10.15623/ijret.2013.0211052