Optimum Power Controller for Random Number Generator in the Crypto Module of Ubiquitous Computing Environment

Critical cryptography applications require the production of an unpredictable and unbiased stream of binary data derived from a fundamental noise mechanism, which is quite difficult to create with a stable random bit stream, as required for statistical randomness, when using a random generator with only a hardware component. However, since all electronic systems are influenced by a finite bandwidth, 1/f noise, and other non-random influences, perfect randomness cannot be preserved by any practical system. Thus, when generating random numbers using an electronic circuit, a low-power white noise signal is amplified, then sampled at a constant sampling frequency. Yet, it is quite difficult to create an unbiased and stable random bit stream, as required for statistical randomness, when using a random generator with only a hardware component and in especially it has occur the drift phenomena of input power. Therefore if the randomness of output bit stream is beyond limits range, it is applied the regulation of input power range to take the output bit stream, through the evaluation of randomness by constant period of output bit stream. Accordingly, this paper proposes a method for stabilizing the input power of a random number generator using optimum power control mechanism in crypto module hardware. As such, the proposed scheme is designed to reduce the statistical property of a biased bit stream and optimize the input power to a random number generator engine in crypto module engine for ubiquitous computing.