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

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