2004

786 | Chapter 27 Protect and Sign Drawings
3 If the file has a valid digital signature, click View Base Signature.
The Digital Signature Contents dialog box displays details of the digital
signature such as the signer, expiration date of the digital ID, serial num-
ber, comments about the digital signature, time stamp, and time service.
4 If the file contains an external reference (xref) that contains a digital
signature, and the View Xref Drawings option in the Validate Digital
Signatures dialog box is selected, click View Xref Signature to view the
external references associated with the file.
5 Click Close.
Command line
SIGVALIDATE
To validate a signature in Windows Explorer
1 In Windows
Explorer, locate a file whose digital signature you want to
check.
Some operating systems display a modified icon for a drawing that has a
valid digital signature attached.
2 Right-click the file name and click Properties.
3 In the Properties dialog box, if the file contains a digital signature, the Dig-
ital Signature tab is displayed. Click the Digital Signatures tab to view the
digital signature details.
A Valid Signature icon is displayed if a digital signature is valid, and an
Invalid Signature icon is displayed if the digital signature is not valid.
4 In the Other Fields list, select an option from the list to view details of the
digital signature, such as the issuer, description, and expiration date of the
digital ID. You can also view the time stamp and time service.
5 When you have finished viewing the digital signature information, click
OK.
To identify a signed file in Windows Explorer
■ In Windows Explorer, locate files that you want to check for a digital sig-
nature. Signed files are displayed with the Digital Signatures icon.
Note The Digital Signatures icon does not display on some operating sys-
tems, including Windows NT 4. However, if you use either of these operating
systems, you can still identify signed files by right-clicking a file in Windows
Explorer, choosing Properties, and reviewing digital signature information on
the Digital Signature tab.