  In recent years, massively multiplayer online games (MMOGs) have become very
popular by providing more entertainment, therefore millions of players now
participate may interact with each other in a shared environment, even though
these players may be separated by huge geographic distances. Peer to Peer (P2P)
architectures become very popular in MMOG recently, due to their distributed
and collaborative nature, have low infrastructure costs, achieve fast response
times by creating direct connections between players and can achieve high
scalability. However, P2P architectures face many challenges and tend to be
vulnerable to cheating. Game distribution between peers makes maintaining
control of the game becomes more complicated. Therefore, broadcasting all state
changes to every player is not a viable solution to maintain a consistent game
state in a MMOGs. To successfully overcome the challenge of scale, MMOGs have
to employ sophisticated interest management techniques that only send relevant
state changes to each player. In this paper, In order to prevent cheaters to
gain unfair advantages in P2P-based MMOGs, several cheat-proof schemes have
been proposed that utilize a range of techniques such as cryptographic
mechanisms, Commitment and agreement protocols, and proxy architecture.
