Method and device for generating and for validating a digital message and application of such a device
US5101430A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1990 |
| Grant date | Mar 31, 1992 |
| Priority date | — |
| Expiry date | Sep 10, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/84
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In this method, a number N is assigned to transmitted and receiving stations comprising synchronous clocks (2), the coded message being obtained by calculating a time Tie from the time elapsed since the initialization of the clock of the transmitting station, a code Ae1 from N and from Tie in accordance with a first relationship, a code Ae2 from Ae1 in accordance with a second relationship, and the coded message M from N, Tie and Ae2, in accordance with a third relationship. The validation operation is performed by calculating a time Tir1 from the time elapsed since the initialization of the clock of the receiving station, a code Ar1 from the received coded message M, from N and from Tir1, by using the third relationship, a code Ar2 from the n highest order bits of Ar1, n being the number of bits of Ae1, a code Ar3 from Ar2 in accordance with the second relationship, a time Tir2 from M, from N and from Ar3, by using the third relationship, and a code Ar4 from N and from Tir2 by using the first relationship, and by verifying that Ar2 is equal to Ar4 and that the absolute value of the difference Tir2-Tir1 is less than a specified threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.