Method for correcting subscriber-based secure call keys
US5966443A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1996 |
| Grant date | Oct 12, 1999 |
| Priority date | — |
| Expiry date | Apr 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/80
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A key variable correction scheme allows errored encryption key material in mobile and portables radios to be quickly identified and corrected. The errored encryption material can be corrected automatically by a key management controller, once detected. Consequently, a mismatch problem can be diagnosed and resolved in a manner which is automatic, therefore quick and efficient, and in a way which overcomes the difficulty which users have in identifying by themselves a mismatch condition since the result is often only silence out of their respective radio speaker. Once the mismatch is corrected by the reassignment of correct keys, the user is free to join the radio call already in progress.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.