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kwlothrop
Copper Contributor
Sep 04, 2023

Windows behavior for multiple code signing signatures on the same executable

Hello community!

 

We've developed a Windows 11 application. The application has an installer executable that is signed with an EV code signing certificate issued by an entity that is trusted by Windows. Additionally, we've signed the installer with a second certificate that is self-signed and not trusted by the operating system that we use for another purpose. Executing the installer by double-clicking it still works and does not complain about an unknown certificate as Windows seems to ignore the second certificate when executing the installer. Is this behavior of Windows ignoring the second certificate, as long as the first one is trusted, guaranteed?

 

Any tips on how to find an answer to this question is appreciated.

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