Method and device for certificateless multi-proxy signature

Abstract

The invention discloses a method and device for certificateless multi-proxy signature, relates to the technical field of communication, and solves a problem of heavy computation load of certificateless multi-proxy signature conducted by bilinear pairings. The method of the invention specifically includes: computing, by a proxy signature apparatus, a public key and a secret key of the proxy signature apparatus in accordance with public parameters, the public key being corresponding to the secret key; obtaining a verification result of a standard signature, and determining whether the standard signature is valid in accordance with the verification result; if the verification result represents the standard signature is valid, computing, in accordance with the secret key, partial proxy signature of the proxy signature apparatus; and transmitting the partial proxy signature to a proxy signature apparatus manager, so that, after the proxy signature apparatus manager computes a multi-proxy signature in accordance with the partial proxy signature, a multi-proxy signature verifying apparatus verifies the multi-proxy signature. The method and the device can be applicable for certificateless multi-proxy signature.

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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