Strengthening the authentication protocol
US6014085A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1997 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Oct 27, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W12/72
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The invention strengthens authentication protocols by making it more difficult for handset impersonators to gain system access using replay attacks. This goal is accomplished using challenge codes as a parameter for determining authentication codes, whereby different challenge codes cause different authentication codes to be generated. In one embodiment, the challenge codes are functions of challenge types (e.g., global or unique challenges) and/or handset states (e.g., call origination, page response, registration, idle, and SSD-A update). This embodiment prevents handset impersonators from successfully utilizing replay attacks to impersonate a legitimate handset if the legitimate handset is in a different state than the handset impersonator, or if the legitimate handset is responding to a different challenge type than the handset impersonator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.