Pseudo-random permutations have many applications in modern cryptography and are known as block cyphers. In other words, one of the important tools for designing security protocols is block cypher.
The purpose of this paper is to enhance data security by using a block cypher mode of operation CBC, which is a symmetric cryptosystem (private key), before steganography, and by using the graph coloring and the correlation of pixels which optimize the information steganography algorithm and create a variable capacity at each threshold.
In advanced cryptography block cypher modes have been designed to be applied to data formats.
Beginning with sections on the basic cryptographic theory and historical cyphers, the volume cover such topics as public key encryption,
block cyphers, hash functions and random numbers and stream cyphers.