Enhanced short message and method for synchronizing and ensuring security of enhanced short messages exchanged in a cellular radio communication system
US6367014B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1999 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | Jan 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/80
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The invention concerns a particular structure of enhanced short message, and a method for synchronizing and ensuring the security of exchanged enhanced short messages having this structure. Conventionally, an enhanced message is transmitted by a message service centre to a subscriber identification module (or SIM module) of a mobile station. The body (2) of this enhanced message contains in particular a first field (3) for remote commands pertaining to a remote application. This body (2) also contains a second field (4) for storing the current value of a synchronizing counter, to be compared to a previous value of the synchronizing counter, stored in the SIM module. The body (2) can contain another field (6) for storing a certificate, the body signature, for proving the authenticity of the enhanced message and the identity of its transmitter. The enhanced message is accepted or refused by the SIM module depending on the coherence of these values with the internal status of the SIM module.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.