Combined signature and verification signature method, system and storage medium

Abstract

The present invention provides a combination signature and signature verification method, system and medium, including: step S1: N groups of equipment ends form a equipment cluster, the equipment cluster determines the combination mode, creates registration, signature and signature verification procedures and submits them to the system; Step S2: The device-side clusters generate private keys or private key fragments locally according to the initialization program; generate a shared public key combination based on at least two combinations of the private key or private key fragments; the shared public key The combination is used to mark the object to be operated, and the private key or private key fragment is used to generate the signature and permit the operation on the marked object. The present invention distinguishes and recombines the signatures generated by multiple groups of device terminals, and sets multi-level signature verification conditions for the combined signatures, so as to realize splitting the control right to multiple parties while retaining the absolute control right of some signatories, and solve the problem involving third parties. The problem of federated counterfeit signatures can arise with hosted prior art.

Description

Combined signature and signature verification method, system and storage medium technical field The present invention relates to the technical field of block chain, in particular, to combined signature and verification signature method, system and storage medium. Background technique The private key-public key pair based on asymmetric cryptography technology and its signature and verification operations are often used in CA certificate systems. In the security infrastructure of application scenarios such as system, data transmission, digital asset transaction, and electronic contract signing, it has been faced with two difficult situation. Take the digital asset transaction that has received more attention in recent years as an example: by generating a set of private key-public key pairs, use the public key to Declare a certain digital asset and quantity, and use the private key to control its transfer. On the one hand, existing application tools such as wallets ca...

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent application publication number CN110741600A has published "Providing Decentralized Protocols to Retrieve Encrypted Assets Computer-implemented System and Method", which enables two types of signatures to be accessible by setting access rights to digital assets on the blockchain This digital asset, and introduces the collective storage private key share of the decentralized blockchain network, which is used to generate a threshold signature to represent the user's access to the digital asset. Although the possible security risks of private key distribution and copying are avoided, there is still a risk of Sybil attack

And due to the irreversible nature of the private key-public key generation process, additional access rights are set for digital assets that have been stored under a certain pair of private key-public keys in the blockchain, that is, a private key that meets the threshold signature requirements is deduced backward from a public key. Key share feasibility is very low

[0005] And the above two technologies provide solutions to deal with the loss of private keys for the situation where the user owns the complete private key, and do not involve the situation where the user entrusts the assets to a third-party organization, and solves third-party credit risks and other issues

[0006] Prior art, such as "A Signature Method, Device and System Based on Secure Multi-Party Computing" published by the Chinese patent application publication number CN109934585A, proposes to allow multiple parties to hold private keys or private key fragments, and based on multiple signatures and threshold signatures , secure multi-party computing and other technologies to manage the control of assets, can split the control to multiple parties, avoid the credit risk caused by a single party holding control, and only need m of n parties (m<=n) use private The signature can be completed by fragmenting the private key or private key, and it is applied to scenarios involving multi-party signatures such as users, business parties, and supervisors. There is a possibility that at least m parties other than the user may jointly forge signatures

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