Method of producing a proof of presence or of operation of an entity in an identified zone for a duration greater than a given threshold, and monitoring system
US8477038B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2008 |
| Grant date | Jul 2, 2013 |
| Priority date | — |
| Expiry date | Oct 8, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C1/10
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method for producing a proof of the presence and/or of the availability of an entity in a site over a period that is greater than or equal to a presence threshold, the method including: successively transmitting messages, the messages being generated from a secret such that the secret may be reconstituted by having the knowledge of a given number of messages that is greater than or equal to a threshold, each message being transmitted over a transmission period whose duration is chosen such that the product of the duration of the transmission period times the threshold is substantially equal to the presence threshold; comparing the secret and a secret candidate generated from messages received by the entity; the proof being produced only if the secret and the secret candidate are equal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.