4 - how to get started with the SELinux security enhancement.
6 - documentation on the Smack Linux Security Module.
8 - documentation on the AppArmor security extension.
10 - documentation about credentials in Linux.
12 - description of the kernel key request service.
13 keys-trusted-encrypted.txt
14 - info on the Trusted and Encrypted keys in the kernel key ring service.
16 - description of the kernel key retention service.
18 - documentation on the TOMOYO Linux Security Module.