RNS-based CKKS variant with minimal rescaling error
US12362903B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2022 |
| Grant date | Jul 15, 2025 |
| Priority date | — |
| Expiry date | May 14, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/0618
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods and systems for reducing noise in homomorphic multiplication include: receiving a plurality of ciphertexts, each having a corresponding level; receiving data specifying a homomorphic multiplication on two ciphertexts; for two ciphertexts having different levels: adjusting a scaling factor of a first ciphertext so that the respective scaling factors of the two ciphertexts are the same; performing the homomorphic multiplication; and rescaling a result of the homomorphic multiplication; for two ciphertexts having the same level: performing the homomorphic multiplication; rescaling a result of the homomorphic multiplication; and using the scaling factors of the two ciphertexts during a decryption process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.