Chaotic Based Grain 128-Bit Stream Cipher for Image Encryption

Secure transmission and storage of data are most important for a successful communication system. Cryptography protects the information so that the intruder cannot have access to the data of interest. There are various algorithms implemented to transform the information to be transmitted into cipher form so that it does not have any traces of its original form and can be protected from trespasser. Chaotic based Grain 128-bit is a stream cipher made up of a linear and a non-linear feedback shift registers, which is fed by a chaotic logistic map and a Boolean non-linear filter, which is fed by both LFSR and NLFSR. Key is generated using Chaotic based Grain 128-bit stream cipher and is used in the application for image encryption. The generation of the key is implemented on Xilinx ISE xc7a100t-3csg324 using Verilog code is also discussed. Analysis of the work is done by plotting a histogram of input, encrypted, and decrypted images.