DWG drawing visualization electronic seal and electronic signature method and interaction system

Abstract

The invention relates to the technical field of CAD (Computer Aided Design) electronic signatures, and discloses a DWG drawing visualization electronic seal and electronic signature method and an interaction system. Abstract data of a DWG drawing is calculated, a character set is obtained after the abstract data is processed, a visual seal primitive is coded by the character set and stored in a DWG file, and the DWG drawing is encrypted; when the DWG drawing is opened or stored, abstract data of the DWG drawing is calculated and decoded, a visual seal is displayed if decoding succeeds, or otherwise, the DWG drawing fails; and according to the method, the MD5 value of the DWG is used for coding the visual seal, when the DWG drawing is tampered, the MD5 value is changed, and the visual seal disappears, so that related personnel can simply, conveniently and visually see whether the DWG drawing is tampered or not, and the use threshold of tampering prevention of the DWG drawing is lowered. According to the method, the compatibility with the traditional universal CAD electronic signature technology is also realized, and the system upgrading difficulty is reduced.

Description

technical field [0001] The invention relates to the technical field of CAD electronic signatures, in particular to a DWG drawing visualization electronic seal and electronic signature method and an interactive system. Background technique [0002] The electronic signature generated by the existing CAD design output DWG file is not intuitive, and it is not friendly to the experience of most engineers involved in industrial design. Most industrial design participants have a good understanding of computer cryptography, tamper-proof and electronic signature technologies. Low, does not have the ability to use the "universal CAD electronic signature" technology to identify whether the DWG drawings after the audit and seal have been tampered with, resulting in the difficulty in the application and promotion of the traditional "universal CAD electronic signature". For the transformed derivatives (such as: PDF drawing files, paper DWG drawings) during use, it is not easy to judge whe...

AI Technical Summary

Problems solved by technology

[0002] The electronic signature generated by the existing CAD design output DWG file is not intuitive, and it is not friendly to the experience of most engineers involved in industrial design. Most industrial design participants have a good understanding of computer cryptography, tamper-proof and electronic signature technologies. Low, does not have the ability to use the "universal CAD electronic signature" technology to identify whether the DWG drawings after the audit and seal have been tampered with, resulting in the difficulty in the application and promotion of the traditional "universal CAD electronic signature". For the transformed derivatives (such as: PDF drawing files, paper DWG drawings) during use, it is not easy to judge whether to endorse

[0003] In the prior art, CN112052435A discloses "a method for multi-user electronic signature of CAD drawings", which includes: initiating signatures on CAD drawings to obtain CAD drawings with signature certificates and time stamps; Archiving of CAD drawings, informing each signatory user to sign; when the signatory user receives the CAD drawing, he signs it a priori (judging whether the current DWG drawing has been tampered with during the circulation process), and then the user signs electronically. When DWG drawings are signed, the verification technology is used to verify whether they have been tampered with, and the signature time needs to be added to the signature, which is cumbersome to operate

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