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About Digital Signatures for Executable Files
A digital signature is a block of encrypted information added to certain files to
identify the originator and indicate whether a file has been altered since the digital
signature was applied.
Executable files with digital signatures provide the following benefits:
- Recipients of executable files are provided with reliable information about who created
the executable file. - Originators of executable files are provided with reliable verification that the executable
has not been modified since it was digitally signed. - Users of executable files are provided assurance that the files haven’t been modified
to contain viruses, spyware, or other malware.
You can examine a file’s digital signature through a chain of trust back to the root
certificate issued by a trusted certificate authority (CA). The digital signature
for signed executable files can be accessed by right-clicking the file, clicking Properties,
the Digital Signatures tab, the name of the signer and the Details button, and then
View Certificate.
Executable Files Associated With AutoCAD-Based Products
The following file types are executable or can contain executable code: ARX, CRX,
CUI, CUIx, DBX, DLL, DVB, EXE, FAS, HDI, JS, LSP, MNL, PGP, RX, SCR, and VLX. Autodesk
protects you by digitally signing the executable files in its software products, however,
CUI, CUIx, DVB, JS, PGP, and SCR files can contain executable code, but cannot be
digitally signed yet. It is recommended that these types of files be located in read-only
folders accessible by a CAD or network administrator.
Invalid Digital Signatures
A digital signature will become invalid for the following reasons:
- The file was modified after the digital signature was attached.
- The file was corrupted in transit or when the digital signature was attached.
- The digital certificate was revoked by the certificate authority.
Digital Signatures and AutoLISP Files
To attach a digital signature to an AutoLISP file, you must either have a digital
certificate issued by a certificate authority, or you can create a self-signed certificate
using one of several utilities.
To assure the integrity of shared AutoLISP executable files, use the AcSignApply utility
to apply digital signatures to the files. If you later need to revise a digitally
signed AutoLISP file make your changes, manually delete the digital signature block
at the end of the file, and then assign a new digital signature.
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