Fully homomorphic encryption for fixed-point elements
US12284267B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2023 |
| Grant date | Apr 22, 2025 |
| Priority date | — |
| Expiry date | Aug 22, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3093
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A computer-implemented method comprising: receiving, as input, a ciphertext x representing a computational result of an approximated fully-homomorphic encryption (FHE) scheme, wherein ciphertext x comprises an underlying number m and an accumulated computational error e; iteratively, (i) performing a bit extraction operation to extract a current most significant bit (MSB) x′ of ciphertext x, (ii) calculating accuracy parameters α, β associated with x′; (iii) applying a step function to the extracted MSB x′, based, at least in part, on the calculated accuracy parameters α, β, to reduce or remove the accumulated computational error e and to return a clean MSB b, and (iv) repeating steps (i)-(iii) for all bits included in the underlying number m; and reconstructing and outputting, from all of the returned clean MSBs b, the number m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.