Image encryption using permutation generated by modified Regula-Falsi method

摘要

Transmission and sharing of multimedia data have drastically increased in the last few years due to the availability of low-cost image capturing devices, development of communication technology, and the popularity of social networks. However several security fissure of a public network such as the Internet has made the jobs of eavesdroppers easy to grab the contents without any impediment. Well-known cipher techniques like DES, AES, RSA can be used to encrypt an image. But, due to the huge volume and high correlation of image data, a lightweight image encryption method is important. Permutation-based encryption methods disrupt the correlation and can act well with huge volumes. Chaos theory is proved to generate pseudo-random sequences and is extensively used to define permutation. A wide range of image encryption proposals based on the permutation defined by the chaotic map is found in the literature. Several non-chaotic techniques are also gaining popularity for defining a permutation. An image encryption proposal based on a non-chaotic method is presented in this current communication. The permutation is defined by the modified Regula-Falsi method and image encryption is achieved by pixel value substitution and iterative addition with the cyclic shift. As the result of the proposed method, fully noisy images are obtained. Security analysis has proved immunity against different attacks. Comparison with state-of-the-art methods has established the applicability of the proposed technique in image encryption.