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This paper presents the architecture design of a high efficient and non-memory Advanced Encryption Standard (AES) crypto core to fit WPAN security requirement. The proposed basis transformation approach from Galois Field (28) to Galois Field GF(((22)2)2) can significantly reduce the hardware complexity of the SubBytes Transformation (S-box). Besides, the on-the-fly key expansion function is used to replace the RAM-based, and the new on-the-fly key scheduler fully supports AES-128, AES-192 and AES-256. Moreover, resource-sharing scheme will also be employed to reduce the hardware complexity of the cipher and decipher. Experiment results show that the AES core works at 100 MHz clock it takes about 400 ns and 770 ns to complete an AES-128 encryption and decryption, respectively. That is, the corresponding throughputs are 320 Mbps and 166 Mbps. The hardware cost of the AES design is about 16.4 K logic cells with 3-in-1 key scheduler included. Experiment results also show that the proposed design is suitable for integration into the WPAN system chips due to its acceptable power dissipation.
Date of Conference: 19-21 Oct. 2009