Method and device for multi-proxy signature without certificate

Abstract

The invention discloses a method and device for multi-proxy signature without certificate, relates to the technical field of communication, and solves the problem of large amount of calculation for multi-proxy signature without certificate by using bilinear pairing. The method of the present invention may specifically include: the proxy signature device calculates the public key and private key of the proxy signature device according to the public parameters, and the public key corresponds to the private key; obtains the verification result of the standard signature, and determines whether the standard signature is valid according to the verification result; if The verification result is used to indicate that the standard signature is valid, and the partial proxy signature of the proxy signature device is calculated according to the private key; the partial proxy signature is sent to the proxy signature device administrator, so that after the proxy signature device administrator calculates multiple proxy signatures based on the partial proxy signature , the multi-proxy signature verification device verifies the multi-proxy signature. Applicable to certificateless multi-proxy signatures.

Description

technical field [0001] The invention relates to the field of information security, in particular to a method and device for certificateless multi-proxy signatures. Background technique [0002] Public key cryptosystems can be divided into three categories: 1. Public key cryptosystems based on certificates; 2. Public key cryptosystems based on identity; 3. Public key cryptosystems without certificates. Among them, certificate-based public-key cryptosystems have certificate management problems, which require more storage, computing, and communication resources; identity-based public-key cryptosystems have inherent key leakage problems; certificateless public-key cryptosystems solve the above problems. Two problems, certificateless multi-proxy signature schemes mostly operate based on bilinear pairs. [0003] In the prior art, certificateless multi-proxy signatures (that is, multi-proxy signatures based on certificateless public key cryptosystems) can usually be used. Certific...

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Problems solved by technology

[0005] In the process of realizing the above-mentioned certificateless multi-proxy signature, the inventor found at least the following problems in the prior art: the non-certificate multi-proxy signature scheme is based on bilinear pairing, and the calculation of bilinear pairing is relatively large. Used in the implementation of signature operations, it takes longer than other mechanisms

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