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# Security and system protection

Overview of VOS3 security architecture with links to platform protection and key management topics.

## Security and system protection

VOS3 uses layered protections across hardware, boot, software installation, and runtime isolation.

Use this section to understand the core protection model and the operational security features around keys and PCI-POI flows.

### In this section

Start with the topic that matches your task:

* [Platform security model](/adk-os-platform/readme/security-and-system-protection/platform-security-model.md) — domain separation, secure boot, tamper behavior, and protected cardholder data flow
* [Security functions and key management](/adk-os-platform/readme/security-and-system-protection/security-functions-and-key-management.md) — PCI-POI functions, key storage, remote loading, and security extensions

### Related topics

* [Lifecycle, modes, and startup](/adk-os-platform/readme/lifecycle-modes-and-startup.md) — APP-DEV mode, warrantied keys, and startup behavior
* [VOS3 Password Management](/adk-os-platform/readme/vos3-password-management.md) — MAC password policy and access groups


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