Method and device for digital file signature

Abstract

The invention provides a method and equipment for a digital document signature. The method comprises the steps that a signature information generation device obtains an original digital document of an electronic picture type from the external, generates a signature data series according to the MD5 encryption algorithm and inserts the signature data series into the original digital document of the electronic picture type; a signature information extraction and verification device obtains the original digital document of the electronic picture type from the external and extracts and verifies the signature data series according to a document signature verification configuration table, wherein the signature data series is inserted into the original digital document of the electronic picture type. The method and equipment for the digital document signature can achieve off-line authentication and prevent the digital document and associated signature information from being falsified illegally.

Description

technical field [0001] The present invention relates to a file signature method and equipment, more specifically, to a method and equipment for digital file signature. Background technique [0002] At present, with the increasingly wide application of computers and networks and the increasing variety of businesses in different fields, the method and device for signing digital documents (such as electronic bills in the financial field) (such as electronic endorsements in the financial field) become more and more important. [0003] The basic working principles of existing methods and devices for digital file signature are as follows (taking electronic endorsement in the financial field as an example): use the endorser’s private key to encrypt the signature information to obtain the first calculation result, and use the endorsee’s Encrypting the first calculation result with a public key to obtain ciphertext data; converting the ciphertext data into electronic graphic signatu...

AI Technical Summary

Problems solved by technology

[0004] However, the existing methods and devices for digital file signatures have the following problems (taking the electronic endorsement of electronic bills in the financial field as an example): (1) Since two pairs of keys are used in the process of generating signature information Symmetric encryption algorithm, so in the process of signature information verification, only online verification can be performed with the signer, and multiple signers cannot continuously sign a single digital file; (2) The signature information of the signer is not consistent with that of the digital file The content is associated, so it cannot effectively prevent tampering with digital files in the form of pictures

Images