Two-party collaborative signature method and system based on ECDSA algorithm

The technical scheme of the invention provides a two-party collaborative signature method and system based on an ECDSA algorithm. A complete signature is finally calculated by splitting a private key, separately storing respective sub-private keys by two communication parties and exchanging a plurality of signature components generated by the two parties during collaborative signature, and the components of the private key are introduced in calculation of a k value corresponding to a standard ECDSA signature algorithm through design of a collaborative signature algorithm, so that a complete signature is obtained. The risk that an attacker reckons a private key component by repeatedly intercepting exchange information of both parties is avoided, and the algorithm security is further enhanced. According to the technical scheme, the security problem of the private key in the ECDSA algorithm software password module is solved, and the component of the private key is introduced in the calculation of the k value co