A Reconfigurable Permutation Based Address Encryption Architecture for Memory Security

Most of the existing memory encryption techniques in IoT devices are based on data encryption. The level of security increases at the cost of the increased encryption algorithm complexity, resulting in large power consumption and area overhead for high-security devices. In this paper, we take a significantly different approach to encrypt the device memory through address encryption. A reconfigurable architecture called Permutation based Address Encryption (PAE) is proposed, for the first time, to encrypt the device memory with minor hardware overhead and much shorter processing time. The architecture is synthesized in SMIC 40nm standard CMOS technology. Compared with Data Encryption Standard (DES), the proposed PAE achieves 16x encryption speed and 1.4x effective key length. When combined with the DES, the PAE+DES encryption outperforms existing hardware Advanced Encryption Standard (AES) with almost 2x in power efficiency, more than 1.5x in area efficiency and better security, making it a promising hardware encryption technique for IoT devices.