Apokalypser

I am interested in a solution using less disk space. I assume the server uses most of the game files to check the integrity of those file on the client. please correct me if there are other reasons, I would love to learn about them. Continuing that assumption I would first try to replace the md5 tool with a tool knowing the checksums and telling the server the correct values for every file without having the files transfered to the server. Any comments on this? The intention of this post is to learn if I have any chance of success with my idea. Greetings