This paper focuses on improving the cipher strength of a particular ubiquitous processor HCgorilla. The reason why this is called the ubiquitous processor is due to its specific features for ubiquitous computing. Ubiquitous computing is really a leading edge trend of next generation information and communication technologies. One of the most promising solutions for ubiquitous computing applied to HCgorilla is exploiting not higher speed but parallelism. It has progressed the overall status of ubiquitous and processor techniques. The basic organization of HCgorilla follows multicore and multiple pipelines. These are Java compatible media pipelines (shortened to pipes hereafter) with sophisticated structures and cipher pipes. The cipher pipe implements transposition cipher called RAC (random number addressing cryptography) by using a hardware RNG (random number generators). Although RAC is excellent at software-transparency, it is not always sufficient for practical security. Since emerging ubiquitous environment requires strong security as well as high performance, it is also a crucial issue to enhance cipher strength. Thus, the improved HCgorilla in this study embeds two RNGs. These are used for double cipher, that is, the one for RAC and the other for a substitution cipher by data sealing. This approach promises strong cipher strength without any overhead for hardware cost, power dissipation, throughput, etc. Various aspects of the improved HCgorilla are evaluated.
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