A Time Stamp Generation Method Based on Blockchain Digital Signature

A digital signature and blockchain technology, applied in digital transmission systems, user identity/authority verification, secure communication devices, etc., can solve problems such as dependence and inability to solve single point failures

Active Publication Date: 2021-09-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Subsequent work has proposed a large number of improvement schemes, but the existing schemes all rely on a trusted third party and cannot solve the problem of single point of failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] Blockchain is a public blockchain. For the digital signature generated by any user in the system, any other user in the system can verify the data signature through Blockchain and generate an accurate and consistent time stamp. The following takes signer A and verifier B as examples for illustration.

[0011] 1. System parameter establishment stage:

[0012] If there are n blocks linked after a block in the Blockchain, it can be confirmed that the block is on the Blockchain. The system generates a secure hash function H(.), signature algorithm Sig A (.) and the corresponding verification algorithm Ver A (.), subscript A means signer A. T=Sig A (M) indicates that signer A signs message M and obtains signature T. Ver A (M, T) indicates that the verifier verifies the validity of the signature T of the signer A on the message M, and returns true if it is valid, and returns false if it is invalid. || represents a connection symbol. The signature algorithm Sig can be ...

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PUM

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Abstract

The invention discloses a block chain-based digital signature time stamp generation method, which mainly includes three stages: a system parameter establishment stage, a signature stage, and a verification stage. Among them, in the signing phase, the signer obtains the hash values ​​of the n latest confirmed blocks in the blockchain, and binds these n hash values ​​with the message M to be signed as M', and for M 'Sign to get the signature T, the signer calculates the hash value h of M'||T, and uploads h to the blockchain through the transaction Tx. After the verifier completes the verification of the signature T, the time range after the generation time of the block where the nth hash value is located and before the generation time of the block where the transaction Tx is located is taken as the timestamp of the signature T, which is a decentralized An accurate method for timestamping digital signatures.

Description

technical field [0001] The invention belongs to data protection technology, and in particular relates to a method for time stamping digital signatures. Background technique [0002] Timestamp is proof that a digital file was created at a certain time and is an essential tool for protecting the evidentiary value of digital information. In 1990, Stuart Haber et al. proposed a time stamping scheme for digital files on CRYPTO 90. This scheme uses a trusted center to sign the hash value and current time of digital files to realize the unforgeability of time stamps. . Subsequent work has proposed a large number of improvement schemes, but the existing schemes all rely on a trusted third party and cannot solve the problem of single point of failure. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an implementation method for timestamping digital signatures based on block chain technology. [0004] The technical solut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/32
CPCH04L9/3297H04L9/3247H04L9/3236H04L9/50H04L9/083H04L9/3242H04L2209/805H04L9/3239
Inventor 许春香李闯张源
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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