Decryption device, cryptographic system, and decryption method
US11909873B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 19, 2021 |
| Grant date | Feb 20, 2024 |
| Priority date | — |
| Expiry date | Dec 15, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3073
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An encryption device (20) generates a ciphertext by setting, in the ciphertext, one of a predicate vector of arithmetic branching programs (ABP) and an attribute vector over a basis B of the basis B and a basis B*, which are dual bases in dual vector spaces. A key generation device (30) generates a decryption key by setting, in the decryption key, the other one of the predicate vector and the attribute vector over the basis B*. A decryption device (40) decrypts the ciphertext by performing a pairing operation on the ciphertext generated by the encryption device (20) and the decryption key generated by the key generation device (30).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.