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With the continuous development of computer networks, security of data is particularly important. AES algorithm is the new data encryption standard after DES algorithm, which has a higher security and faster running speed. Since the promulgation, it has been widely analyzed and multi used around the world. AES algorithm is iterative algorithm,which needs a key generator to generate the encryption and decryption keys for each round.The key generator mainly designs two modules including S box replacement (SubWord) module and Cycle left shift (RotWord) module. After processing results and Rcon array XOR, the key generator may generate an expanded key. The whole design has a simple circuit structure, less resource-intensive, fast running speed advantages, with good prospects for practical applications. |
