Proposing of Developed Advance Encryption Standard

This paper presents a variant of Advance Encryption Standard (AES) cipher that is depending on the same structure of the original AES Substitution Permutation Network (SPN) and the same mathematical background represented by Galois Field (GF28). The proposed cipher encrypt and decrypt data with block size of 512-bit and with key size of 128-bit expanded into 512-bits which means encrypt block that four times larger than the block of the original cipher and provide high margin of security with key size 128-bit of key needs 2⁵¹² possibility instead of 2¹²⁸, since this cipher is based on two perfect techniques for the expansion and generating key reaching to 512-bit for each round. This cipher depends upon strong mathematical foundations and solid algebraic representation and introduces deeper insights in developing AES.