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Information sharing method and device

An information sharing and secret information technology, applied in the field of information sharing methods and devices, can solve the problems of low efficiency of secret sharing, inability to divide secret information, etc.

Pending Publication Date: 2021-11-30
北京信安世纪科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This application provides an information sharing method and device to solve the problem of low secret sharing efficiency in the prior art due to the inability to directly divide the secret information on the elliptic curve domain

Method used

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  • Information sharing method and device

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Embodiment Construction

[0073] In order to improve the efficiency of secret sharing, in order to improve the efficiency of secret sharing, in order to improve the efficiency of secret sharing, in the embodiment of the present application, a solution for information sharing is provided. .

[0074] The scheme is: acquiring target secret information, target share m and recovery threshold k, wherein the target secret information satisfies a preset elliptic curve equation; constructing a k-1 degree polynomial equation based on the elliptic curve equation and recovery threshold k, and based on The k-1-degree polynomial equation divides the target secret information into m sub-secrets, where the k-1-degree polynomial equation is constructed by the base point of the elliptic curve equation, the generated group, and any k sub-secrets in the m sub-secrets are used for Recover target secret information; send m sub-secrets to m secret sharing devices respectively.

[0075] The preferred embodiments of the...

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PUM

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Abstract

The invention discloses an information sharing method and device. The scheme is used for solving the problem of low secret sharing efficiency caused by the fact that secret information on an elliptic curve domain cannot be directly segmented in the prior art. The method comprises the steps of obtaining target secret information, a target share m and a recovery threshold k, wherein the target secret information meets a preset elliptic curve equation; then constructing a (k-1)-degree polynomial based on a group generated by base points of the elliptic curve equation, and segmenting the target secret information into m sub-secrets based on the (k-1)-degree polynomial; and respectively sending the m sub-secrets to the m secret sharing devices. Thus, the target secret information on the elliptic curve can be directly segmented, and the secret segmentation efficiency is improved.

Description

technical field [0001] The present invention relates to the technical field of network information, and in particular, to an information sharing method and device. Background technique [0002] Secret sharing is a commonly used cryptographic technique. The idea is to split the secret in an appropriate way. Each share after splitting is managed by different participants. A single participant cannot recover the secret information, and only several participants work together. Collaboration to recover secret messages. [0003] However, in the prior art, the secret sharing algorithm is designed based on the integer domain, which cannot directly segment the secret information on the elliptic curve domain, resulting in low secret sharing efficiency. Taking the private key in the SM9 algorithm as an example, the SM9 algorithm generates a The private key belongs to the point on the elliptic curve. It is necessary to convert the private key to the integer domain, and then split the c...

Claims

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Application Information

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IPC IPC(8): H04L9/30H04L9/08G06F17/11G06F17/15
CPCH04L9/3066H04L9/3026H04L9/085G06F17/11G06F17/15
Inventor 张宇汪宗斌
Owner 北京信安世纪科技股份有限公司