UEFI Secure Boot
UEFI Secure Boot builds on the long-standing secure boot process of Amazon EC2, and provides additional defense-in-depth that helps customers secure software from threats that persist across reboots. It ensures that the instance only boots software that is signed with cryptographic keys. The keys are stored in the key database of the UEFI non-volatile variable store. UEFI Secure Boot prevents unauthorized modification of the instance boot flow.
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