Impact of using a double cipher scheme on the implementation of a particular ubiquitous processor

Emergent ubiquitous environment requires power conscious strong security, high performance, high precision, and real time responsibility. With respect to this view point, a particular ubiquitous processor, HCgorilla is really eligible. This processor covers small scale for mobility and parallelism for Java-based media processing and hardware cryptography for media streaming. The media processing holds scheduling free ILP (instruction level parallelism) due to the use of media pipelines whose execution stage is a wave-pipelined multifunctional unit. The hardware cryptography is software-transparent due to the use of cipher-dedicated pipelines. This is preferable to mobile computing that requires simple resource, but the previous version of HCgorilla had not always practical cipher strength. In order to improve the secure possibility of HCgorilla, the authors apply a double cipher scheme with two RNGs (random number generators) to the cipher pipeline. This paper presents the evaluation of the improved HCgorilla from various perspectives: strength, power consumption, throughput and area. Then, discussion is held about a tradeoff between complexity and security, and the impact of using the double cipher scheme on the implementation of HCgorilla. Since the double cipher has practical ability to keep temporary security without permanent network infrastructure, it is really applicable for ad-hoc cipher streaming.