Method and apparatus for verifiably providing key recovery information in a cryptographic system
US5907618A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1997 |
| Grant date | May 25, 1999 |
| Priority date | — |
| Expiry date | Jan 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0894
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for verifiably providing key recovery information to one or more trustees in a cryptographic communication system having a sender and a receiver Each communicating party has its own Diffie-Hellman key pair comprising a secret value and corresponding public value, as does each trustee The sender non-interactively generates from its own secret value and the public value held by the receiver a first shared Diffie-Hellman key pair comprising a first shared secret value, shared with the receiver but not with any trustee, and a corresponding public value. For each trustee, the sender then non-interactively generates an additional shared secret value, shared with the receiver and the trustee, from the first shared secret value and the public value corresponding to the secret value held by the trustee. The sender uses the additional shared secret value to encrypt recovery information for each trustee, which is transmitted to the receiver along with the encrypted message. Each trustee can decrypt its recovery information by regenerating its additional shared secret value from its own secret value and the public value of the first shared Diffie-Hellman key pair. The re…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.