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Identity-based multi-proxy signature method and device for protecting private key

A proxy signature and multiple technology, applied in the field of identity-based multi-proxy signature, can solve the problem of not being able to use multiple proxy signature key protection, unable to solve the problem of key protection in application scenarios, etc., to avoid the problem of revocation of identity, anti-key leaked effect

Active Publication Date: 2021-09-03
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a helper, which can be used for key protection of proxy signature system, but not for key protection of multi-proxy signature
[0006] The above three methods cannot be used in the application scenario where an original signer authorizes a group of proxy signers to sign on behalf of the original signer, so it cannot solve the key protection problem in this application scenario

Method used

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  • Identity-based multi-proxy signature method and device for protecting private key
  • Identity-based multi-proxy signature method and device for protecting private key
  • Identity-based multi-proxy signature method and device for protecting private key

Examples

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Embodiment Construction

[0044] The present invention will be further described in detail below with reference to the accompanying drawings.

[0045] The present invention provides an identity-based multi-agency signature method for protecting private keys, setting a trusted assistant, by helping agent signature generating initial private key and public key and at the starting point of each time Make updates, generate N agent signers' sub-proxy keys, N agent signers unite to generate multiple agent signatures, message verifiers receive multiple agent signatures and N agent signers identity after receiving multiple agent signs Verify multiple agency signatures. like figure 1 As shown, specifically includes the following steps:

[0046] Step 1: Build an identity-based multigency signature system and establish system parameters.

[0047] The identity-based multigency signature system constructed of the present invention includes a user equipment and a helper device. Suppose κ is a safety parameter, g 1 Is a ...

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Abstract

The invention discloses an identity-based multi-proxy signature method and device for protecting a private key. The method comprises the following steps: (1) constructing an identity-based multi-proxy signature system and establishing system parameters; (2) generating a real-time user private key and an assistant secret key; (3) generating real-time sub-proxy keys of n proxy signers; (4) combining the n proxy signers to generate a real-time multi-proxy signature; and (5) after receiving the real-time multi-proxy signature, the message verifier verifying the real-time multi-proxy signature by using the identity of the original signer and the identities of the n proxy signers. According to the invention, an independent and physically safe credible assistor is arranged for each original signer and proxy signer, and the assistor helps the original signer and proxy signer to generate the initial private key of the cryptosystem when the original signer and proxy signer utilize the secret values selected by the original signer and proxy signer, so that the identity revocation problem is avoided, and the key leakage prevention function is realized.

Description

Technical field [0001] The present invention relates to a multi-agent signature method for protecting a private key, in particular to an identity-based multi-agent signature and device based on protecting the original signature private key, a proxy signer private key, and sub-proxy private key. Background technique [0002] With the development of computer network technology, digital signatures replaced traditional manual signatures, solved problems such as pre-discipline, reliance and tampering in the network. Multiple agent signs is a signature with special features that can be used in applications where the signature cannot complete the signature. The user of the multiple agent signature scheme includes the original signature, multiple proxy signaturers, and the authenticator signed by the agent. The original signature will delegate the signature rights to multiple agent signers, multiple agent signers jointly generate agency signature, and the agent signature verifier verifie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08H04L9/32
CPCH04L9/3247H04L9/0861H04L2209/76
Inventor 陈剑洪王文豪
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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