Multipartite contract signing method based on aggregated signature

A contract, multi-party technology, applied in the direction of public keys, electrical components, transmission systems, etc. for secure communications

Inactive Publication Date: 2010-10-27
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the existing technology, there is no safe, efficient and fair multi-party contract signing method based on the aggregate signature scheme in the world

Method used

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  • Multipartite contract signing method based on aggregated signature
  • Multipartite contract signing method based on aggregated signature
  • Multipartite contract signing method based on aggregated signature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0097] The method for signing multi-party contracts based on aggregated signatures provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0098] figure 1 Represents the complete process of the multi-party contract signing method based on aggregated signatures. The specific implementation steps are as follows:

[0099] Step 101 represents signer P i Broadcast and send its own contract-credential aggregate signature to other n-1 signers through the broadcast channel. likewise other signatories It also needs to broadcast its own contract-credential aggregate signature. The order of sending is not required.

[0100] Step 102 represents checking the signer P i Whether received from other signatories All n-1 valid contract-credential aggregate signatures for . If no other n-1 contract-voucher aggregate signatures are received, or the received contract-voucher aggregate signatures fail verification, go to step 107....

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PUM

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Abstract

The invention relates to a multipartite contract signing method based on aggregated signature, which is characterized in that signers participating in contract signing use aggregated signature and public key cryptosystem broadcasting methods to complete signing process, when any party refuses to admit the signing behavior, a third party can be involved to solve the disputes. The method needs support of an off-line trusted third party, and the trusted third party generates a certificate signature which can be used as an authorized signature for recovering the contract when disputes occur. In the method, a singer uses the certificate signature to generate a contract-certificate aggregated signature and sends the contract-certificate aggregated signature to other signers by broadcasting to complete commitment exchange; after reviving valid contract-certificate signatures of other signers, the signer sends the contract signature by broadcasting to complete the contract signature exchange; and when disputes occur in the exchange process, the signer request the trusted third party to execute a dispute resolution method. The method only needs tow rounds of unordered information exchange and has high execution efficiency and certifiable safety.

Description

technical field [0001] The invention relates to a multi-party contract signing method, in particular to a multi-party contract signing method based on aggregated signatures. Background technique [0002] With the continuous advancement of computer and network technology, e-commerce and mobile commerce have become one of the main forms of modern network-based economic activities. How to exchange electronic data through the network in a fair way between distrusting parties has attracted widespread attention, and the fair exchange protocol is the key to e-commerce and mobile commerce. The so-called fairness means that when two or more parties (more than two parties) are allowed to use the protocol to exchange information, it can ensure that all participants either get the expected electronic data information or do not get any valuable information. Fairness is a key issue that most exchange protocols must address. [0003] To achieve strict fairness, the protocol must introduc...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L9/30
Inventor 孙艳宾谷利泽郑世慧孙斌杨义先
Owner BEIJING UNIV OF POSTS & TELECOMM
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