Anything wrong with NOT signing a .NET assembly?
One of my colleagues is very keen on signing assemblies. He literally tries to sign anything. Even when we use assemblies from Microsoft that are not signed, he will take the source code, sign it and then ask other developers to use his copy instead.
I can understand the basic idea behind signing an assembly: to ensure a particular assembly is not compromised by some dodgy hacker. So if we are a software development company, we should sign our assembly before releasing some .NET library to our customers.
However, we primarily develop web applications for our own use here, and I just can't see the point of signing every single assembly we use.
Am I missing something here?
Answer
I've taken advantage of non-signed assemblies to get around issues before and in academic settings shown people why it's important. I replaced a DLL file that was unsigned (again in an academic setting) with one I made with the same name, same signatures, and used .NET Reflector to copy and paste the original code, but in mine I emailed user names and passwords that were being passed in before calling 'real' code.
If signed, you can make a signature match, but not replace. Contrary to what Zippy says, there will be a run-time compliation error.
Signing assemblies is never overkill. It takes 30 seconds. It's like saying locking your doors is overkill if you live in the country. If you want to gamble with your belongings, go ahead, leave it open. It only takes one security breach to get fired. It only takes 30 seconds to sign an assembly and there's no business case not to. The performance impacts is negligable.