Methods and apparatus for providing a secure paging system
US5285496A · kind A · utility
130Cited by
6References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1992 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Dec 14, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/80
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A paging system which sends and receives encrypted messages. The message may be encrypted either by the sender of the message or by the paging system. Multiple keys may be used for encrypting and decrypting. Public key systems may also be used and integrated into this paging system. The paging system can send out time update messages containing the current time and date. The pagers use the time update messages to automatically update the time in an internal clock. Time stamps can be inserted into the encrypted messages to prevent unauthorized users from replaying old messages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.