Encryption method and apparatus with forward secrecy and random-access key updating method
US7095850B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 17, 2001 |
| Grant date | Aug 22, 2006 |
| Priority date | — |
| Expiry date | Jul 13, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An encryption method and apparatus that provides forward secrecy, by updating the key using a one-way function after each encryption. By providing forward secrecy within a cipher, rather than through a key management system, forward secrecy may be added to cryptographic systems and protocols by using the cipher within an existing framework. A random-access key updating method can efficiently generate one or more future keys in any order. Embodiments are applicable to forward secret ciphers that are used to protect protocols with unreliable transport, to ciphers that are used in multicast or other group settings, and to protection of packets using the IPSec protocols.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.