Add secure boot chapter

book/arch/06-secure-boot.md

@@ -1,3 +1,66 @@
 # Setup secure boot
 
-TBD
+This chapter describes how to configure secure boot because no one should modify the bootloader or boot from another medium. 
+Gerke Max Preussner describes this very detailed in his post [Fully Encrypted ArchLinux with Secure Boot on Yoga 920](https://gmpreussner.com/reference/fully-encrypted-archlinux-with-secure-boot-on-yoga-920?#secureboot)
+Please read his chapter about secure boot and come back to enable it.
+
+## UEFI setup mode
+To create own UEFI keys UEFI secure boot must be set into setup mode in BIOS. Restart the computer and enter BIOS setup.
+
+1. Navigate to the **Security** page
+1. Go to Set **Administrator/Supervisor Password** and enter a strong password
+1. Go to **Reset to Setup Mode**, press Enter and select Yes
+1. Save the changes and exit BIOS Setup
+
+The preloaded secure boot keys for Microsoft/OEM are now deleted. You can restore it if needed.
+
+## Setup cryptboot
+Download or copy [xmikos/cryptboot](https://github.com/xmikos/cryptboot) to your home folder. To install *cryptboot* some
+packages are required. Let's install them.
+
+```
+pacman -S binutils fakeroot
+```
+
+Next step is to install it without checksum check. Enter the *cryptboot* folder and execute
+
+> You can use *ArchLinux* as name
+
+```
+makepkg -si --skipchecksums
+```
+
+Almost finished. The last step is to generate and enroll the new keys. This is easy with the following commands:
+
+```
+cryptboot-efikeys create
+cryptboot-efikeys enroll
+cryptboot update-grub
+```
+
+## Pacman hooks
+To auto sign the kernel after an upgrade it's handy to have a [pacman hook for signing the kernel](https://wiki.archlinux.org/index.php/Secure_Boot#Signing_kernel_with_pacman_hook). Paste
+Open the file with `/etc/pacman.d/hooks/98-secureboot.hook` and put these lines in it.
+
+```
+[Trigger]
+Operation = Install
+Operation = Upgrade
+Type = Package
+Target = linux
+
+[Action]
+Description = Signing Kernel for SecureBoot - Update GRUB
+When = PostTransaction
+Exec = /usr/bin/cryptboot update-grub
+```
+
+## Enable UEFI secure boot
+If you encountered no errors you can now enable UEFI secure boot. Restart the computer and enter BIOS setup.
+                                                                  
+1. Navigate to the **Security** page
+1. Go to **Secure Boot** and enable it
+1. Save the changes and exit BIOS Setup
+
+Try to boot from an USB stick. It should not be possible anymore. If you need to boot from an other medium, disable
+secure boot.