Permutation-Substitution architecture based image encryption algorithm using middle square and RC4 PRNG

摘要: The growing importance of information security over recent years has prompted development secure encryption algorithms. Most the traditional algorithms such as AES and DES are computationally intensive. Hence, in this paper we propose a simple but symmetric key algorithm. image approach makes use two pseudorandom number generators to encrypt images. Middle Square Algorithm is used swap columns followed by swapping rows. This permutation step produces intermediary cipher image. Subsequently, RC4 algorithm produce stream pseudo-random numbers. These numbers substitute intensity pixels image, which gives final encrypted Various analysis tests performed on quality results these prove that proposed efficient.