Methods and apparatus for providing secure two-party public key cryptosystem
US8520844B2 · kind B2 · utility
5Cited by
2References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 20, 2003 |
| Grant date | Aug 27, 2013 |
| Priority date | — |
| Expiry date | Jun 5, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3013
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Techniques for an efficient and provably secure protocol by which two parties, each holding a share of a Cramer-Shoup private key, can jointly decrypt a ciphertext, but such that neither party can decrypt a ciphertext alone. In an illustrative embodiment, the secure protocol may use homomorphic encryptions of partial Cramer-Shoup decryption subcomputations, and three-move Σ-protocols for proving consistency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.