Random Number Generator Based on MicroScale Bioelectrochemical Cell System Random number generators (RNG) are essential components for security system. RNGs are used in sensitive applications such as key generation and challengeresponse based authentication. Therefore, ensuring the unpredictability of the generated bits is very important to keep the all system in safe. This paper presents RNG based on microscale bioelectrochemical cell system that provides alternative way of producing random bit streams. The system here is fabricated by using photolithography process and the main purpose of the micro device is analyzing the activity of microorganism that produces electrons to generate power. We use the randomly produced voltage value over time to generate strong random numbers which are successfully passed the NIST 800xe2x80x9322 statistical randomness tests after SHA224 hash algorithm postprocessing method. This alternative method ensures secure data transfer where bioelectrochemical cell system needs to be used such as environmental protection sensor networks, vehicles power by bioelectrochemical cell system, and portable electronic devices.

A Robust Random Number Generator Based on Chaotic Ring Oscillators A robust chaosbased random number generator (RNG) system is newly proposed. Output bitstreams generated from this new RNG system is tested on NIST80022 test suite. Proposed RNG circuit fulfill all fifteen randomness tests of NIST80022 without undergoing any postprocessing implementations except for the X OR operation. While classical ring oscillator based RNG systems needs at least 25 rings, each of them containing 13 inverters, and 25 D flipflops to pass all the tests, newly designed RNG system pass all the tests successfully with 10 chaotic new subcells containing 20 ring oscillators with 13 inverters and each subcell includes two resistors, a capacitor and two diodes. These are enough for the new system to generate sufficient randomness without any D flipflops. Experimental results are demonstrated and comparisons are made among the new design, classical ring oscillator based RNGs and another chaotic ring oscillator based RNG. Noise analysis of the new RNG is also performed to show that the system has a nondeterministic entropy source which secures the system against possible synchronization attacks.