Welcome to 
This portal talks about security software. Technical words can be used but should be explained.
Apt
apt-transport-https - Download apt packages through https
Device Encryption
cryptsetup - Disk encryption support
Encrypted Communication
PKI/Certificates
ca-certificates - Common CA certificates
openssl - Secure Socket Layer (SSL) binary and related cryptographic tools
pyca - Certification Authority written in Python
Sandbox
firejail - Restrict application environment
VPN
openvpn - Virtual private network daemon
strongswan - IPSec utilities for strongSwan
vpnc - Cisco-compatible VPN client
CategoryProposedDeletion - This page merely list packages.