This is not so easy as you think on windows and I want the code in C# and not as a Dll since I want my program
to work as a single stand alone .exe

I am not after bloatware where you need 5,000 lines of code, it must be fast and work on the fly so it can be
used with a socket stream so that movies and big files can be streamed across an unreliable network.

Just buffering up the data before sending it back in a fixed sized blocks on the server nodes is not really an option
and even then the client might not receive the block on the network as a full block so this is why I am after on-the-fly
encryption.