Data processing method and device based on multi-party homomorphic encryption, equipment and medium
By acquiring and processing the ciphertext information and auxiliary keys of each participant, the problem of a fixed number of participants in Threshold-FHE is solved, enabling flexible expansion of the ciphertext of the participants' computation results and improving the system's scalability.
CN117278200BActive Publication Date: 2026-07-24BEIJING REALAI TECH CO LTD
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING REALAI TECH CO LTD
- Filing Date
- 2023-10-31
- Publication Date
- 2026-07-24
AI Technical Summary
Technical Problem
Threshold-FHE has poor scalability, requiring a fixed number of participants in advance and cannot be flexibly expanded.
Method used
By obtaining the first ciphertext information and auxiliary key of each original participant, as well as the second ciphertext information and auxiliary key of the new participant, the ciphertext of the operation result of the preset operation is determined based on this information, thereby enabling the expansion of the participants.
Benefits of technology
It improves the scalability of Threshold-FHE, allowing for flexible addition of participants during the computation process while maintaining the validity and reliability of the computation results.
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Figure CN117278200B_ABST
Abstract
Embodiments of the present disclosure disclose a data processing method and device based on multi-party homomorphic encryption, equipment and medium, wherein the method comprises: obtaining first ciphertext information corresponding to each original participant; in response to at least one new participant joining, obtaining second ciphertext information corresponding to each new participant; obtaining first auxiliary key corresponding to each original participant and second auxiliary key corresponding to each new participant; determining the operation result ciphertext corresponding to the preset operation based on the first ciphertext information and the first auxiliary key corresponding to each original participant, and the second ciphertext information and the second auxiliary key corresponding to each new participant. Embodiments of the present disclosure realize the expansion of participants in the process of operating the ciphertext of the original participants through auxiliary keys, which can improve the expandability of the number of Threshold-FHE participants.
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