MobiLock: An Energy-aware Encryption Mechanism for NVRAM-based Mobile Devices

Emerging non-volatile memory (NVRAM) has been considered as the most promising candidate of DRAM for future main memory design in mobile devices. NVRAM-based main memory exhibits attractive features, such as byte-addressability, low standby power, high density and near DRAM performance. However, the nature of non-volatility makes NVRAM vulnerable to be attacked by malicious programs. Though several data encryption techniques have been proposed to solve this problem, they do not consider the limited resources in mobile devices. To address this issue, in this paper, we propose an energy-aware encryption mechanism, named MobiLock, to effectively enhance the security of NVRAM-based main memory in mobile devices. The basic idea is to enhance the encryption and decryption performance by utilizing cache and concurrency mechanisms, respectively. To achieve this, we first develop a cache mechanism to cache the encrypted intermediate data (i.e., PAD) whose plaintexts are updated frequently, for accelerating decryption and reducing reamputation of PAD. We then propose a concurrency mechanism to read the ciphertext in NVRAM and calculate the PAD simultaneously, to reduce the decryption latency. The evaluation results show that our technique can effectively reduce encryption energy consumption and decryption latency, respectively.