GPG
GNU Privacy Guard

What is it?

Encryption and Signing software

Web of trust

Package
GnuPG2

Key Generation
--gen-key
--full-gen-key

Usage
-r - Set recepient
-s - Sign a message
-e - Encrypt a message
-d - Decrypt a message
--verify - Verify a signature
-a - ASCII armor output

Key Exchange
--export
--import

Key Management
--sign-key
--edit-key

Demo

#gpg2 --full-gen-key
#	1
#	2048-4096
#	Expiry
#		compromise
#	User id
#	Password
#	entropy
#	
#gpg2 -r "recipient" -e "file"
#gpg2 -d "file.gpg"