CN110866285A - PDF batch seal verification method based on GPU - Google Patents

Abstract

The invention discloses a confirmation method of digital communication, and particularly relates to a PDF batch seal verification method based on a GPU. Reading an electronic signature in an electronic signature form in PDF through equipment configured with a GPU; reading the data byte range protected by the signature, calculating the hash value of the electronic signature protection data, obtaining a hash value by using a public key and an asymmetric encryption algorithm, and comparing the two values to confirm whether the two values pass or not. The invention has the advantages that the effect of batch processing can be realized, and the safety of data is ensured by matching with the processes of Hash calculation and asymmetric decryption.

Description

PDF batch seal verification method based on GPU

Technical Field

The invention relates to a confirmation method of digital communication, in particular to a PDF batch seal verification method based on a GPU.

Background

The existing electronic signature verification technology uses a serial processor (such as a CPU) to complete a calculation task in a signature process, and serial verification refers to verifying one signature and then verifying the next. With the popularization of electronic signature technology, a large number of electronic signatures may need to be verified for one electronic contract at present, a long time is required for all electronic signatures in one electronic contract to be verified, and the requirement of electronic signature verification service is increasing. The efficiency of serial signature verification is too low.

In order to realize efficiency, particularly under the condition that mass electronic signatures need to be verified, how to realize high efficiency becomes a problem to be solved in the prior art; because the gap is not large if the number to be verified is not large.

A Graphics processor (abbreviated as GPU), also called a display core, a visual processor, and a display chip, is a microprocessor that is specially used for image and Graphics related operations on a personal computer, a workstation, a game machine, and some mobile devices (such as a tablet computer, a smart phone, etc.). When a large number of signatures need to be verified, the method has higher overall verification speed.

The principle is that the GPU has stronger parallel computing capability compared with the CPU, and the core of electronic signature verification is Hash computation and asymmetric decryption.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a method for realizing efficient processing of seal verification.

The invention is realized by the following technical scheme:

a PDF batch seal verification method based on a GPU is characterized by comprising the following steps:

(1) reading an electronic signature in an electronic signature form in PDF through equipment configured with a GPU;

(2) reading a signature-protected data byte range from the electronic signature content; the digital signature is used for protecting data from tampering, and naturally has a data protection range;

(3) reading the protected data in the file according to the data byte range protected by the electronic signature;

(4) calculating a hash value of the electronic signature protection data according to the hash algorithm type marked in the electronic signature information, and marking the hash value as hash 1;

(5) decrypting the digital signature in the electronic signature content by using a public key provided in the electronic signature and the type of the asymmetric encryption algorithm to obtain a hash value, and recording the hash value as hash 2;

(6) compare if hash1 is equivalent to hash 2; if the two are the same, the verification is successful; if not, the verification fails.

In the present invention, Adobe software uses the expression "verify signature", which means to verify electronic signature, and here "signature" and "signature" have a semantic meaning. However, the digital signature is another thing, which is generated by cryptography, and is the core of the electronic signature, and the electronic signature is added with information such as a picture, a place, a signature reason and the like on the basis of the digital signature.

The hash referred to in this application may also be represented by a hash or digest. There are many algorithms for hashing, commonly known as sha1, sha256, md5, etc.; asymmetric encryption, which means that encryption and decryption use different keys, is called asymmetric encryption. Common asymmetric encryption algorithms are rsa, ecc, sm 2. And (3) a digital signature, wherein the most core content of the digital signature is obtained by encrypting the hash value by using asymmetric encryption.

Has the advantages that: in the invention, the GPU is used for verifying the electronic signature and the electronic signature, the effect of batch processing can be realized, and the safety of data is ensured by matching with the processes of Hash calculation and asymmetric decryption.

Drawings

FIG. 1 is a schematic flow chart of the implementation process of the invention

Detailed Description

The following detailed description of the invention is made with reference to the accompanying drawings:

example 1

The operation is carried out according to the flow shown in figure 1:

(1) reading an electronic signature in an electronic signature form in PDF through equipment configured with a GPU;

(2) reading a signature-protected data byte range from the electronic signature content; the digital signature is used for protecting data from tampering, and naturally has a data protection range;

(3) reading the protected data in the file according to the data byte range protected by the electronic signature;

(4) calculating a hash value of the electronic signature protection data according to the hash algorithm type marked in the electronic signature information, and marking the hash value as hash 1;

(5) decrypting the digital signature in the electronic signature content by using a public key provided in the electronic signature and the type of the asymmetric encryption algorithm to obtain a hash value, and recording the hash value as hash 2;

(6) compare if hash1 is equivalent to hash 2; if the two are the same, the verification is successful; if not, the verification fails.

With the PDF file containing an electronic signature as an example here, the electronic signature can be viewed and verified by opening using an Adobe or Foxit reader.

After the electronic signature is opened, 1 electronic signature can be seen, and the information of the electronic signature in the electronic signature can be checked by clicking and selecting the signature attribute.

And clicking the verification signature to verify.

Claims (1)

1. A PDF batch seal verification method based on a GPU is characterized by comprising the following steps:

(1) reading an electronic signature in an electronic signature form in PDF through equipment configured with a GPU;

(2) reading a signature-protected data byte range from the electronic signature content;

(3) reading the protected data in the file according to the data byte range protected by the electronic signature;

(4) calculating a hash value of the electronic signature protection data according to the hash algorithm type marked in the electronic signature information, and marking the hash value as hash 1;

(5) decrypting the digital signature in the electronic signature content by using a public key provided in the electronic signature and the type of the asymmetric encryption algorithm to obtain a hash value, and recording the hash value as hash 2;

(6) compare if hash1 is equivalent to hash 2; if the two are the same, the verification is successful; if not, the verification fails.

Images