Hardened random number generator with ring oscillator collapse time random truncation
US10331410B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2016 |
| Grant date | Jun 25, 2019 |
| Priority date | — |
| Expiry date | Mar 27, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2207/7219
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A true random number generator (TRNG) uses an analog circuit with a ring oscillator configured to collapse from an unstable oscillation state to a stable oscillation state at a random collapse time and counter counting a counter value representing the random collapse time. Various techniques are used to harden the TRNG including a truncator generating a true random number based on a truncation of the reference count value and a dedicated voltage regulator supplying power to the analog core including the ring oscillator. Techniques also include various solutions for drawing a constant current such as using a Gray code counter and adding noise current during and/or after the collapse event with a dummy inverter chain. Bit churning, bit obfuscation entropy enhancers and various post processing techniques may be employed to further harden the TRNG. An attack detection module may raise alerts when the TRNG is being attacked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.