Chaos-based image encryption scheme using Galois field for fast and secure transmission
Shan Suthaharan · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2008
Chaos-based image encryption techniques are very useful for protecting the contents of digital images and videos. They use traditional block cipher principles known as chaos confusion, pixel diffusion and number of rounds. The complex structure of the traditional block ciphers makes them unsuitable for real-time encryption of digital images and videos. Real-time applications require fast algorithms with acceptable security strengths. This paper presents a simple chaosbased image encryption scheme using cryptographic operations based on Galois field of order 2n with combinations of a master key, a session key and a key image. A discretized 2D chaotic map and a pseudo random noise are also used to thwart statistical and differential attacks. The proposed approach, in contrast to traditional chaos-based schemes, generates a chaotic map from the key image and then uses this chaotic image to destroy the statistical and perceptual properties of the image to be encrypted using the Galois field operations. The simulation tests use real and synthetic images (a gradient image as the key image) to demonstrate the performance of the proposed approach. The results show that the proposed approach is fast enough for real-time applications and provides acceptable security strength.