Impedance-based physical unclonable function
US10560095B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 2018 |
| Grant date | Feb 11, 2020 |
| Priority date | — |
| Expiry date | May 23, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/88
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
According to various aspects, systems and methods for providing a soft-decoding physical unclonable function are provided. According to one embodiment, PUF circuitry includes circuit elements with impedance values that are used to generate a PUF value. For example, one or more resistors may be connected to a voltage source. The resistors may generate a resulting voltage signal that is measured and indicates a ratio of the impedance values of the resistors. Due to manufacturing variations, each impedance value may be unique, such that the impedance values may be used to provide a unique number sequence. Each ratio value may be converted into a single bit or multi-bit digital value through digitization, for example with a comparator and/or an analog to digital converter, and the series of digital values may represent or be used to generate a unique number sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.