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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.
It's not flawed at all. But its purpose isn't actually to secure anything. Its purpose is to complicate the installation of alternative OS and to perpetuate vendor lock in, while sounding like it's "for your security". In that regard, it has succeeded.
There is also TPM and Microsoft Pluton, which serve the same purpose.