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[Nolan Wright]

For the transport layer, forget WM_COPYDATA and raw named pipes without ACLs — those are trivially spoofable by any process that knows the object name. Use a named pipe (or a localhost TCP socket) with an explicit Windows Security Descriptor: set the DACL so only the game’s and anti-cheat’s specific SIDs (verified via GetSecurityInfo against the well-known SID or a per-installation GUID) can open the handle. The critical part people gloss over is mutual authentication — the channel being reachable doesn’t prove who’s on the other end. Before any meaningful payload, do a challenge-response handshake: the initiator generates a random 256-byte nonce, and the responder authenticates it with HMAC-SHA256 keyed

"Rocket League Grand Champion II | Controller: DualSense 5 Overclocked 1000Hz"

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