An effective method for encrypting a license file?

Question

For a web application, I would like to create a simple but effective licensing system. In C#, this is a little difficult, since my decryption method could be viewed by anyone wi

Answer 1

It appears that the MSDN Samples use default parameters and this results in machine- specific signing such that you cannot sign on one machine and verify on an arbitrary other machine. I modified the logic in those samples to use the keys in my snk on the signing machine and keys from my assembly in the verifying machine. This was done using the logic from the MSDN sample and routines in the (very nicely done) ExcryptionUtils.cs sample linked above.

For signing the file, I used this:

RSACryptoServiceProvider rsaKey = EncryptionUtils.GetRSAFromSnkFile(keyFilePath);

For verifying the file, I used this:

RSACryptoServiceProvider rsaKey = EncryptionUtils.GetPublicKeyFromAssembly
   (System.Reflection.Assembly.GetExecutingAssembly());

BTW: I observed that the XML signature verification ignores XML comments.