Method and apparatus for authenticating a magnetic fingerprint signal using a filter capable of isolating a remanent noise related signal component
US7478751B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 17, 2004 |
| Grant date | Jan 20, 2009 |
| Priority date | — |
| Expiry date | Mar 3, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/12
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system for verifying the authenticity of data contained in a magnetic medium using the remanent noise characteristics of the magnetic medium. In one embodiment, the invention includes a sensing unit configured to generate a signal indicative of the magnetic field of the magnetic medium, an analog-to-digital converter (ADC) in communication with the sensing unit and configured to digitize the analog signal, a filter in communication with the ADC configured to enhance the component of the signal associated with the remanent noise characteristic, a data extraction unit, in communication with the ADC and the filter configured to measure at least bit duration and peak location and an authentication extraction unit, in communication with the filter and the data extraction unit configured to extract a set of scaled samples from the output of the filter representative of the remanent noise characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.