Signing windows executable/dll

[MartinD]

Hello,
I have some questions about signing executables/dll in qt for WIndow 7, 8, 10. Our software will be downloaded from our website and installed by end users.

1. What are the reasons to sign executable/dll?

2. How to sign qt executable/dll?

3. Where to get cetificate/tools needed to sign? Is it possible to obtain that for free?

4. Should I sign every single dll which comes with our software? Are dlls loaded by Windows application checked for signature and if it is not correct Windows refuses to load the dll?

[kuzulis]

1. To trust (be sure that your app is not modified by viruses and so on).
2. Read MSDN.
3. Buy it from verisign.
4. Yes, need to sign all binaries.