IMAGE ENCRYPTION USING LOGISTIC-COSINE-SINE CHAOS MAP AND ELLIPTIC CURVE CRYPTOGRAPHY

A number of image encryption schemes based upon chaotic systems proposed in the past, have been found to be vulnerable to known-plaintext attack due to the usage of simple linear mapping functions, predictable trajectories etc. In this paper, we propose a hybrid scheme based upon Logistic-Cosine-Sine chaos system and Elliptic Curve Cryptography. The complex chaos mapping function shall result in uniformly distributed pseudo-random outputs and a wider dynamic range while as the Elliptic Curve based cryptography shall be used to leverage the computationally secure encryption of the image pixels. Simulation of the proposed algorithm has been carried using 512-bit standard Elliptic curve given by ECC Brainpool. Results, security analysis reveal that the proposed encryption technique is both computationally efficient as well as resilient against different types of attacks. Comparative analysis shows that the proposed scheme uses lesser number of point multiplications for encryption, and is faster as compared to similar previous schemes