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Is it common that in multiplayer games, network messages are signatured with a Message Authentication Code? If so, do you think it is performance consuming?

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closed as primarily opinion-based by Arcane Engineer, MrCranky, Byte56♦ Mar 20 '14 at 14:58

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.
    
do you mean MAC address ? –  concept3d Mar 20 '14 at 12:18
    
This question will be closed probably. There's no specific problem in it. –  Krom Stern Mar 20 '14 at 12:22
    
I mean the Message Authentication Code. –  Liess Jemai Mar 20 '14 at 12:36
1  
I'm thinking you mean a session token that authenticates the message, so that the server can know the request is legitimate? This is a very valid question, and something that web developers handle very frequently. There are definitely approaches to creating session validation that multiplayer games SHOULD use IMO to guarantee legitimacy and prevent hacking as best as possible. –  Tim Holt Mar 20 '14 at 16:04

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