Secure Boot verifies that firmware-based software is signed by trusted certificates during Windows startup, blocking anything that does not match. It is part of the UEFI standard, introduced in 2011, and prevents untrusted code from running before Windows loads. Microsoft originally issued Secure Boot certificates in 2011 and made Secure Boot optional in Windows 8 and Windows 10. Secure Boot became mandatory in Windows 11. In 2023, Microsoft issued replacement Secure Boot certificates to address emerging threats. These newer certificates began rolling out in 2024, and most devices shipped in 2025 and later already include them. Older certificates expire starting in June, so users and IT administrators must ensure devices have the updated certificates installed.
"Secure Boot is a security feature that verifies that all firmware-based software is signed by a trusted certificate when Windows starts up. If something doesn't match, it gets blocked. This all happens immediately on boot, before Windows or anything else loads."
"Secure Boot is a part of the UEFI firmware standard, which replaced the older BIOS model for modern PCs. It was added to UEFI in 2011 so that only trusted, signed code could run during startup."
"Microsoft issued its original Secure Boot certificates in 2011 and introduced Secure Boot as an optional feature in Windows 8. It remained optional in Windows 10, since UEFI had not had much time to penetrate the market when Windows 10 was released in 2015. But Secure Boot became mandatory in Windows 11."
"Microsoft in 2023 issued new Secure Boot certificates to replace the 2011 versions. Those began rolling out on Windows devices in 2024, and according to Microsoft, nearly all devices shipped in 2025 and later already include the 2023"
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