Cipher system, encryption apparatus, decryption apparatus, cipher method, encryption method, decryption method and program
US11757620B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 2019 |
| Grant date | Sep 12, 2023 |
| Priority date | — |
| Expiry date | Aug 12, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2209/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An encryption system for performing encryption and decryption by a multi-input inner product functional encryption having a function hiding property includes a setup unit configured to generate, taking a vector length m and the number of arguments μ of an inner product function as input, a master secret key msk and a public parameter pp by using a setup algorithm of a single-input inner product functional encryption having a predetermined characteristic and having a function hiding property and a key generation algorithm of a common key encryption satisfying a predetermined condition, an encryption unit configured to generate, taking the master secret key msk, the public parameter pp, an index i of the arguments, and a vector x as input, a ciphertext cti corresponding to the index i by using an encryption algorithm of the single-input inner product functional encryption and an encryption algorithm of the common key encryption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.