Method and apparatus for providing interoperability between key recovery and non-key recovery systems
US6535607B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1998 |
| Grant date | Mar 18, 2003 |
| Priority date | — |
| Expiry date | Nov 2, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0894
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for ensuring that a key recovery-enabled (KR-enabled) system communicating with a non-KR-enabled system in a cryptographic communication system transmits the information necessary to permit key recovery by a key recovery entity. In a first embodiment, data is encrypted under a second key K that is generated as a one-way function of a first key K′ and a key recovery block KRB generated on the first key K′. The key recovery block KRB and the encrypted data e(K, data) are transmitted to the receiver, who cannot decrypt the data without regenerating the second key K from the first key K′ and the key recovery block KRB. In a second embodiment, data is encrypted under a second key K that is generated independently of the first key K′. A third key X, generated as a one-way function of the first key K′ and a key recovery block KRB generated on the second key K, is used to encrypt the XOR product Y of the first and second keys K′, K. The key recovery block KRB, the encrypted XOR product e(X, Y) and the encrypted data e(K, data) are transmitted to the receiver, who cannot decrypt the data without regenerating the third key X from the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.