Signature method, device and system based on secure multi-party computing

Abstract

The embodiment of the invention discloses a signature method, device and system based on secure multi-party computing. The method comprises the following steps: obtaining transaction data, and generating a transaction hash from the transaction data by utilizing a preset rule; determining the signature level of the transaction data according to the relationship between the transaction limit and a first threshold value in the transaction data; determining a signature mechanism based on the signature level, the signature mechanism being a trusted mechanism for signing the transaction data; basedon the private key fragment stored by the determined signature mechanism and the private key fragment stored by the client, obtaining a signature file; wherein the transaction hash is signed and authenticated based on secure multi-party computing, private key fragments are stored in the trusted institution and the client respectively, and the private key fragments are composed of part of sub private keys generated based on segmentation of an asymmetric key. By utilizing the embodiment of the invention, the potential safety hazard of private key loss or stealing can be effectively solved, and the transaction security is greatly improved.

Description

technical field [0001] The embodiment solutions of this specification belong to the field of information security technology, and in particular relate to a signature method, device and system based on secure multi-party computation. Background technique [0002] Secure Multi-Party Computation (MPC) is a collaborative computing problem that solves the problem of privacy protection among a group of mutually distrusting parties. It can be abstractly understood as: each participant has its own private data, and calculates the public function without leaking its own private data, and when the calculation of the entire function is completed, each participant only knows the calculation result and does not know other The data of the parties and the intermediate data of the calculation process. It can be seen that applying secure multi-party computing to asset transaction security and the management of future digital assets plays an important role. [0003] At present, in digital a...

AI Technical Summary

Problems solved by technology

Although this scheme can largely alleviate the security problem of a single key being lost or stolen, in an extreme situation: when both personal and institutional keys are stolen, the security of assets cannot be guaranteed

It can be seen that the existing widely used asymmetric key schemes still have great security problems

Images