The Master Key Under the Doormat: How a Copy-Pasted Code Wrecked 13 Years of PC Security

For thirteen years, the PC ecosystem relied on a promise of cryptographic integrity. When you power on a modern computer, a sequence of checks verifies that the operating system has not been compromised by low-level malware. This mechanism, known as Secure Boot, was marketed as an absolute defense against persistent bootkits. The reality is that this defense relied on a master key left under the doormat.