Electronic digital signature (EDS) is a block of enciphered information added inside files or placed near files to prevent their changes and save information about their creator.
Adding EDS is called signing a file. Two variants of signing are realized:

  • Creating internal EDS in the process of saving the file.
  • Creating an external EDS file.

To digitally sign a file it is necessary to have a digital certificate issued by the independent certification center. You can also create a self-signed certificate using one of the programs.
Digital signature can be validated. It is important in joint work on projects and on receipt of executable file. You can verify the signature authenticity, name of organization or person who signed the file, etc.

Invalid digital signatures

A digital signature can become invalid for the following reasons:

  • The file was modified after the digital signature was attached (renaming a file does not invalidate its digital signature).
  • The digital certificate was revoked by the certification center.

Reapply a Digital Signature to a Drawing file

In some cases, you might need to make changes to a drawing file and then reapply your digital signature. In those cases, use WBLOCK command, specifying the entire drawing, and save it to a different file name for the sake of version control. Then apply your digital signature.
The mechanism allows you to attach EDS to a file when it is saved.
First you should set EDS certificate;

  • in the current document open Attach digital signatures command DIGITALSIGN;
  • in the opened dialogue box check the red flag of the required certificate;
  • check the flag Attach digital signature after saving drawing.
    When saved, the signed file gets sign.

Validate digital signatures command (SIGVALIDATE) allows you to verify validity of the file’s electronic digital signature. The command shows in the command line information on the presence and attributes of EDS of the current file.
The mechanism allows you to create a file of electronic digital signature of the form FileName.Format.sig and sign files of any format.
First start Specify digital signature certificate command (SIGNCERTIFICATESCONTROL) and check the flag of the required EDS certificate.

To create EDS file, use Sign external file command (SIGNFILE) and select the file to be signed.
Validate digital signature command (VALIDATESIGN) allows you to verify whether the selected file corresponds to the digital signature file. First, specify the signed file FileName.Format, then EDS file FileName.Format.sig.

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