Multiparty joint key production and digital sign method and system

A technology of digital signature and joint signature, which is applied in the field of information security and can solve problems such as hidden private key security leakage.
CN107017993AActive Publication Date: 2017-08-04BEIJING JN TASS TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING JN TASS TECH
Publication Date
2017-08-04

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Abstract

The invention provides a multiparty joint key production and digital sign method and system. A joint sign private key d is composed of m private key factors di. The i is equal to [1, m]. The m is greater than or equal to 3. The m private key factors di are produced by the joint parties independently and secretly when the private key is produced and are stored in own devices secretly. The joint digital sign is finished by the parties according to a certain sequence and is finished jointly through utilization of the secretly stored key factors di based on calculation. The system comprises m joint parties. Each joint party has an independent subsystem. Each subsystem is composed of three parts: a joint key production module, a joint sign first component calculation module and a joint sign second component calculation module. According to the method and the system, the multiparty joint key production and digital sign method of an SM2 cryptographic algorithm and various formed systems: acentric and centered systems are realized. The digital sign is no longer finished by a single individual and is finished by multiple parities jointly.
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Description

technical field

[0001] The invention relates to the technical field of information security, in particular to a multi-party joint key generation and digital signature method and system. Background technique

[0002] According to the application, the asymmetric or public key cryptosystem can be used to generate a key pair (d, P), including a public key P and a private key d. The private key d is kept secret and is mainly used for digital signature S of specific data. In view of the increasingly widespread use of the Internet, it is possible for mobile APPs, service centers, signature centers, and multiple service entities to jointly perform user signatures with terminals.

[0003] The traditional method is that the signing device independently and secretly produces a set of key pairs (d, P), and keeps the private key d secretly. When a digital signature is required, the signing device independently uses the private key d to calculate the digital signature value Sign=(r, s)....

Claims

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