Methods and apparatus for providing efficient password-authenticated key exchange
US7076656B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 2001 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | Feb 12, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0844
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A secure protocol is provided which uses a Diffie-Hellman type shared secret, but modified such that the two parties may authenticate each other using a shared password. In accordance with the invention, a party generates the Diffie-Hellman value gx and combines it with a function of at least the password using a group operation, wherein any portion of a result associated with the function that is outside the group is randomized. The resulting value is transmitted to the other party. The group operation is defined for the particular group being used. Every group has a group operation and a corresponding inverse group operation. Upon receipt of the value, the other party performs the inverse group operation on the received value and the function of at least the password, and removes the randomization of any portion of the result associated with the function that is outside the group, to extract gx such that the other party may then generate the shared secret gxy using its knowledge of y.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.