An efficient implementation of the Advanced Encryption Standard (AES) algorithm. The presented architecture is adapted for AES encryption, encryption/decryption designs. The sub and inv-sub-bytes operations are implemented using composite field arithmetic. Efficient architecture for performing the mix columns & inverse mix columns operation, which is the major operation in the Advanced Encryption Standard (AES) method of cryptography. The authors perform the same using ancient Vedic mathematics techniques. The cryptographic unit involving mix columns & inverse mix columns for AES was designed.