In any wireless communication security is crucial during data transmission. The encryption and decryption of data is the major role in the wireless communication for security of the data. Encryption algorithms are used to ensure the security in the transmission channels. Similarly the area and the power consumption is another major thing to be viewed since most of the mobile terminals are battery operated. So a mobile terminal which has an encryption unit with less area and power consumption is appreciated. This paper deals with the Advanced Encryption Standard (AES) which works on a 128 bit data encrypting it with 128,192,256 bits of keys (ciphers) in a single hardware unit.