tpm and device-bound keys

The tpm and device-bound keys tag covers discussions of Windows Hello for Business PINs and the security model behind them. A PIN is created for one specific Windows device, remains local to that device, and unlocks a protected cryptographic key rather than serving as a reusable password sent to a server. The topic also focuses on TPM-backed deployment and policy-enforced enterprise authentication, helping explain why a short PIN can provide stronger protection when it is bound to the device. This archive is useful for understanding how local credentials and hardware-backed keys fit into Windows sign-in and enterprise security practices.