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Entropy 2018, 20(7), 513; https://doi.org/10.3390/e20070513

On the Entropy of Oscillator-Based True Random Number Generators under Ionizing Radiation

1
Electronic Technology, Carlos III University of Madrid, 28911 Leganés, Spain
2
Centro Nacional de Aceleradores (CNA), Universidad de Sevilla, CSIC, 41092 Sevilla, Spain
3
Department of Computer Science, Carlos III University of Madrid, 28911 Leganés, Spain
*
Author to whom correspondence should be addressed.
Received: 31 May 2018 / Revised: 19 June 2018 / Accepted: 6 July 2018 / Published: 9 July 2018
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Abstract

The effects of ionizing radiation on field-programmable gate arrays (FPGAs) have been investigated in depth during the last decades. The impact of these effects is typically evaluated on implementations which have a deterministic behavior. In this article, two well-known true-random number generators (TRNGs) based on sampling jittery signals have been exposed to a Co-60 radiation source as in the standard tests for space conditions. The effects of the accumulated dose on these TRNGs, an in particular, its repercussion over their randomness quality (e.g., entropy or linear complexity), have been evaluated by using two National Institute of Standards and Technology (NIST) statistical test suites. The obtained results clearly show how the degradation of the statistical properties of these TRNGs increases with the accumulated dose. It is also notable that the deterioration of the TRNG (non-deterministic component) appears before that the degradation of the deterministic elements in the FPGA, which compromises the integrated circuit lifetime. View Full-Text
Keywords: TRNG entropy; ionizing radiation; ring oscillator; self-timed ring; NIST TRNG entropy; ionizing radiation; ring oscillator; self-timed ring; NIST
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Martin, H.; Martin-Holgado, P.; Peris-Lopez, P.; Morilla, Y.; Entrena, L. On the Entropy of Oscillator-Based True Random Number Generators under Ionizing Radiation. Entropy 2018, 20, 513.

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