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Microsoft’s Secure Boot has been broken for a decade and no one noticed until now
(www.welivesecurity.com)
This is a most excellent place for technology news and articles.
This is especially true on computers where it is impossible to change the signing keys. Smartphones, game consoles, many laptops, some desktops, smart TVs, IoT devices, modern cars, etc.
Kind of. You can change the signing key for the operating system, but you cannot change the signing key of the primary bootloader, as that is baked into the SoC.