Machine Owner Key (MOK) – Understanding the UEFI Secure Boot Chain

MOK Architecture. The keys added via mokutil via any Linux OS, will be stored in the MOK database. Since its a boot service variable, it will be stored in the BIOS NVRAM. On next boot the shim layer will prompt for enrolling the key. Once enrolled the key can be used to validate the respective async drivers (not part of OS distribution) by kernel to allow installing them during OS boot or run time.

Source: Machine Owner Key (MOK) – Understanding the UEFI Secure Boot Chain

Understanding How Facebook Disappeared from the Internet

The Internet is literally a network of networks, and it’s bound together by BGP. BGP allows one network (say Facebook) to advertise its presence to other networks that form the Internet. As we write Facebook is not advertising its presence, ISPs and other networks can’t find Facebook’s network and so it is unavailable.

Source: Understanding How Facebook Disappeared from the Internet

Loading Test Signed Code – Windows drivers | Microsoft Docs

All the production version of the drivers are WHQL signed. However you may need to load a test driver as part of verifying the driver functionality during development. This requires the driver to be test signed. To run a test signed driver in windows requires test signing to be turned on. below is the command to turn on and off test signing.

To turn on loading test signed drivers

Bcdedit.exe –set TESTSIGNING ON

To turn off loading test signed drivers

Bcdedit.exe –set TESTSIGNING OFF

Source: Loading Test Signed Code – Windows drivers | Microsoft Docs

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