TPM and Remote Attestation Explained: How Call of Duty Uses Hardware Trust in 2026
Modern anti-cheat systems are moving beyond traditional hardware identifiers. By leveraging TPM 2.0, Secure Boot, and Microsoft's remote attestation infrastructure, games can verify the integrity of a system from the moment it powers on.
Understanding how these technologies work helps explain why modern hardware enforcement is significantly more difficult to circumvent than traditional hardware bans.
What the TPM Chip Actually Is
TPM, short for Trusted Platform Module, is a dedicated security processor built into nearly every modern gaming PC.
Some systems use a discrete TPM chip mounted directly on the motherboard, while others rely on firmware-based implementations such as Intel PTT or AMD fTPM.
The TPM's primary role is to securely store cryptographic keys and measure the integrity of the system during boot.
Unlike software-based security mechanisms, TPM operations occur in isolated hardware, outside the direct control of Windows applications and drivers.
Understanding the Endorsement Key
Every TPM contains a unique cryptographic identity known as the Endorsement Key (EK).
The private portion of this key never leaves the TPM itself. The corresponding public component can be used to establish trust between the device and external verification services.
Because these identities originate from hardware, they provide a much stronger trust signal than traditional identifiers such as disk serial numbers or MAC addresses.
This hardware-backed identity is one of the reasons modern anti-cheat vendors are increasingly interested in TPM technologies.
The Secure Boot Chain: Trust Begins Before Windows Loads
Modern platform security begins long before a game launches.
1. UEFI Firmware Starts
The system firmware initializes hardware and records measurements describing the platform state.
2. Secure Boot Verification
Secure Boot validates critical boot components, ensuring only trusted software loads during startup.
3. Windows Loads
Windows, security policies, and virtualization protections are initialized and measured.
4. Integrity Verification
Security-sensitive applications can later verify that the system booted in an expected and trusted state.
Because every stage measures the next, changes made early in the boot process can be detected later through attestation mechanisms.
Remote Attestation and Microsoft Azure
Traditional anti-cheat systems often rely heavily on information collected directly from the player's computer.
Remote attestation changes this model.
Using services such as Microsoft Azure Attestation (MAA), applications can request cryptographically signed evidence describing the security state of a device.
Instead of simply trusting information provided by the local machine, verification occurs on remote infrastructure operated by Microsoft.
Remote attestation shifts trust away from the local client and toward hardware-backed measurements verified by external servers.
While Activision has discussed leveraging advanced platform security technologies within Ricochet, modern anti-cheat systems across the industry increasingly rely on hardware-backed trust models similar to those enabled by TPM and cloud attestation platforms.
PCR Registers Explained
TPMs maintain a collection of secure measurements known as Platform Configuration Registers (PCRs).
| PCR | Typical Measurement |
|---|---|
| PCR 0 | UEFI firmware measurements |
| PCR 4 | Boot manager state |
| PCR 7 | Secure Boot configuration |
| PCR 11 | Windows boot configuration |
These measurements collectively create a cryptographic fingerprint describing how the system booted and whether important security protections remained enabled.
Which Games Use Hardware-Backed Security?
| Game | Security Requirements |
|---|---|
| Valorant | TPM 2.0 + Secure Boot required on supported systems. |
| Call of Duty | Ricochet increasingly leverages platform security and integrity checks. |
| Fortnite | Uses kernel anti-cheat but does not currently require TPM. |
| Counter-Strike 2 | Primarily account and behavioral enforcement. |
The Future of Anti-Cheat
The gaming industry is steadily moving toward hardware-backed trust models.
Kernel drivers alone are no longer sufficient for many competitive titles. Instead, anti-cheat vendors are increasingly combining kernel protections, behavioral analytics, Secure Boot, virtualization security, and remote attestation technologies.
As these technologies continue to evolve, understanding how modern platform security works will become increasingly important for players, developers, and security researchers alike.