Digital signature method, system and device

Abstract

The invention relates to the technical field of cryptology, and particularly provides a digital signature method, system and device. The digital signature method is applied to a server, a second private key ciphertext is stored in the server, the second private key ciphertext comprises a first ciphertext fragment and a second ciphertext fragment, and the second ciphertext fragment is obtained by encrypting the first private key ciphertext according to user identification information input by a user. The first private key ciphertext is encrypted according to the user identification information;thus, the digital signature process is simplified; the second ciphertext fragment is decrypted according to a client decryption key generated by the client to obtain a first private key ciphertext; it is ensured that the second private key ciphertext can be decrypted only under the condition that the user participates in; therefore, the digital signature is completed according to the first private key ciphertext, a counterfeiter cannot forge the user signature singly, the use security of the user private key is improved, the second private key ciphertext is divided into a plurality of segments to be stored, and the security of the user private key is further improved.

Description

technical field [0001] The present disclosure relates to the technical field of cryptography, in particular to a digital signature method, system and device. Background technique [0002] At present, digital signatures based on public key cryptography are gradually applied to various fields with the development of the Internet. In order to improve the security of the user's private key, the traditional method is to combine PKI (Public Key Infrastructure) technology with commercial cryptographic chips, such as online banking. The banking system uses USB key (U-shield) to encrypt information to ensure the security of online transactions. Confidentiality and Authenticity. [0003] However, this method is extremely inconvenient in terms of usability and portability. Users need to carry a USB shield at any time to complete the digital signature, and the user experience is poor. In order to solve the problem of portability, in related technologies, the private key is stored in t...

AI Technical Summary

Problems solved by technology

[0003] However, this method is extremely inconvenient in terms of usability and portability. Users need to carry a USB shield at any time to complete the digital signature, and the user experience is poor

In order to solve the problem of portability, in related technologies, the private key is stored in the client in the form of software, so that the user does not need to carry a USB shield, but the security performance is greatly reduced, and it is entirely possible for the attacker to obtain the complete key from the client. Therefore, how to improve the security of digital signatures becomes an important issue

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