![]() ![]() ![]() But this also opens you up to malware bootloaders, so do this with care. You can run older versions of Windows that don't support Secure Boot's public/private key authentication, or experimental operating systems that would not ordinarily work. This is not recommended - if you turn off Secure Boot, any software can boot on your PC. While Secure Boot works silently in the background and you probably never have reason to change it, you have the option to tweak Secure Boot if you need to: Likewise, other reputable operating systems (like Linux) can also acquire a key and register with UEFI, allowing them to boot securely as well.Ĭonversely, if malware tries to install a bootloader on your PC to take over at startup, it will not have a signed key, and UEFI will not allow it to launch. Windows 10 ships with a certificate that's stored in UEFI this serves as the key that allows it to boot. Secure Boot helps your PC launch safely with the proper operating system, safe from malware attacks. If UEFI has approved the key, the software (like Windows 10) can launch. The operating system's private key is "whitelisted" by UEFI. To do this, the launch software is signed with pairs of public/private security keys. ![]() Secure Boot establishes what programmers refer to as a "trust relationship" between the UEFI and the operating system that it launches at boot time. You may have seen the UEFI interface if you had to access the startup menu by pressing a keyboard shortcut (usually F1 or F2) when the computer is first turned on. While the BIOS was commonly used in computers from the first PC until the 2000s, today virtually all PCs use UEFI. Secure Boot is a feature in UEFI, which has replaced the BIOS on the vast majority of PCs in use today. There was no way for the BIOS to validate or authenticate the software, so anything could boot the PC - Windows, other operating systems like Linux, and even malware. Before Secure Boot, the computer's BIOS (Basic Input/Output System) would hand off control of the PC to any bootloader that was located in the right location on the hard drive. ![]()
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