Certificateless signature method based on Schnorr signature algorithm

Abstract

The invention discloses a certificateless signature method based on the Schnorr signature algorithm. The certificateless signature method mainly solves the problems that the safety is poor and the efficiency is low in the prior art. The certificateless signature method is implemented through the following steps that (1) a public key pkID and secret information skID are generated through a signer; (2) a partial secret information pskID of the signer is generated through a key generation center KGC, and is sent to the signer through a safe channel; (3) the signer signs a message m, and a signature delta is generated; (4) the signature verifier checks the validity of the signature delta, the signature of the message m by the signer is legal if the signature delta is valid, and the signature of the message m by the signer is illegal if the signature delta is invalid. The certificateless signature method can resist stronger attackers, improve the operation efficiency, and be widely applied to a distributed network environment to realize data sharing.

Description

technical field [0001] The invention belongs to the technical field of network security, and relates to an efficient and safe non-certificate signature method in the field of distributed network communication, which can be used to realize safe sharing of data in a distributed network. Background technique [0002] With the development of computer and network communication technology, digital signature technology has been widely used. The traditional digital signature technology is based on the public key infrastructure PKI. PKI maintains and manages a public key certificate store, so it requires huge communication, calculation and storage costs. In order to solve the problem of the authenticity of the public key and reduce the communication, calculation and storage costs of the system, the identity-based digital signature technology IBS is adopted. However, there is an inherent defect in IBS, namely the key escrow problem. In order to solve the key escrow problem in IBS, ...

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Problems solved by technology

[0004] First, although compared with the previous method, this method has fewer system parameters and higher computational efficiency, but it still uses more bilinear pairings, which is difficult to implement in an environment with limited communication bandwidth;

[0005] Second, although this method takes into account the attack of Xia et al. (Key replacement attack on two certificateless signature schemes without random oracles. Key Engineering Materials, 2010,439:1606-1611), it ignores the public key replacement attack and dishonesty KGC is passive and therefore vulnerable to both types of attacks;

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