Self-secure Tightly Coupled Secret Sharing Method

Abstract

The invention discloses a self-safe tightly coupled secret sharing method. The method allows participants to secretly exchange information without relying on a pre-established secure channel during asecret recovery phase, that is, a private channel between any two participants can be established temporarily and flexibly. At that same time, an external attack attempting to acquire the secret needto crack at least m / 2 secure channels, instead of the traditional scheme t / 2 secure channels; Because m >= t, the robustness to channel cracking attacks is better.

Description

technical field [0001] The invention relates to the technical field of network and information security, in particular to a self-safe tightly coupled secret sharing method. Background technique [0002] 1. Secret sharing: [0003] The basic idea of ​​(t,n) threshold secret sharing is to divide a secret into n secret shares, and distribute each share to a participant. Only t(t≤n) or more participants can cooperate. To recover the secret, less than t participants cannot recover the secret, where t is the threshold value. [0004] There are many ways to implement the (t,n) threshold secret sharing scheme, among which the most widely used one is the Shamir secret sharing scheme: [0005] The scheme assumes that D is the secret distributor, n is the number of participants, t is the threshold value, p is a large prime number much larger than n; the secret space and share space are finite fields GF(p). The (t,n) threshold secret sharing scheme is divided into two components: ...

AI Technical Summary

Problems solved by technology

[0018] These two security issues and the special functional requirements of the group scenario application determine that the traditional (t,n) threshold secret sharing scheme represented by the Shamir(t,n) scheme cannot be directly used to construct a group authentication scheme, nor can it be directly used Therefore, it is necessary to construct a new secret sharing scheme to adapt to group authentication and other group-oriented applications.

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