Unidirectional proxy re-encryption
US8094810B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 3, 2006 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Nov 12, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/76
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for performing unidirectional proxy re-encryption includes generating a first key pair comprising a public key (pk) and a secret key (sk) and generating a re-encryption key that changes encryptions under a first public key pka into encryptions under a second public key pkb as rkA→B. The method further includes performing one of the group consisting of encrypting a message m under public key pka producing a ciphertext ca, re-encrypting a ciphertext ca using the re-encryption key rkA→B that changes ciphertexts under pka into ciphertexts under pkb to produce a ciphertext cb under pkb, and decrypting a ciphertext ca under pka to recover a message m. The method also includes encrypting a message m under a public key pk producing a first-level ciphertext c1 that cannot be re-encrypted, and decrypting a first-level ciphertext c1 using secret key sk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.