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Security is playing a very important role in the field of authentication system,network system and Internet. The main goal of cryptography is to secure the data so that it cannot be accessed by any unauthorized user. Cryptography is an emerging tool, which is important for authentication. The AES is a 128 bit Symmetric block Cipher. This paper include enhancing reliability and security, use modified AES (Advanced Encryption Technique) which will be implemented step by step. For the process of encryption various classical techniques are used. These are substitution technique, rearrangement and transformation technique. Key expansion module is introduced in the encryption and decryption modules, which generates key for all iterations. In each iterative rounds addition of an arithmetic operator and a route transposition cipher is introduced in this modification. To increase the immunity against unauthorized attacks, the Key extended module doubles the number of iterative processing rounds.