Conversion key generation apparatus, encrypted text conversion apparatus, decryption apparatus, encrypted text conversion system, conversion key generation method, encrypted text conversion method, decryption method, and program
US11450238B2 · kind B2 · utility
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Key dates
| Filing date | Apr 25, 2019 |
| Grant date | Sep 20, 2022 |
| Priority date | — |
| Expiry date | Jun 29, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/30
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A transformation key generation apparatus has key generation means for receiving a decryption key sks of a first public key encryption scheme Σs and a public key pkd of a second public key encryption scheme Σd, and generating a transformation key utks→d for transforming first ciphertext cts of the first public key encryption scheme Σs into second ciphertext tct of the second public key encryption scheme Σd by using a probabilistic circuit or function secret sharing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.