Method and apparatus for entity authentication and key distribution secure against off-line adversarial attacks
US5491749A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1993 |
| Grant date | Feb 13, 1996 |
| Priority date | — |
| Expiry date | Dec 30, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3271
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method is described for substantially concurrently performing entity authentication operations and short-lived secret key distribution operations over an insecure communication channel between communication partners, wherein authenticity of communication partners is determined by possession of the long-lived shared secret key. The method includes a number of steps. Data flows are exchanged between the communication partners to define a composite key. At least a portion of the data flows have been encrypted or otherwise masked in a manner which utilizes the long-lived shared secret key. At least one authentication tag is passed between communication partners over the communication channel. The at least one authentication tag is based at least partially upon the composite key. The authentication tag is utilized to determine the authenticity of at least one communication partner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.