creating open source online game [closed]

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I started creating online open source game as a project in school. It will be server with n connected clients. But now I have a problem with "security". What to do if one client would used modified source code for changing some restrictions? How can I prevent it? My first idea was make client only for connection to server and server would send all necessary files but I don't like this idea very much. Can you advise me something better? Thank you.

Answer 1

You need to keep your validations in the server. The server should check each client move, and if it's not allowed according to the server's rules - reject it.

You should still keep validations in the client, too, so that users who don't mess with the client code can get speedier responses.