### OpenPGP|GNU Privacy Guard (GPG) ###

 1. Confidentiality - Data (Files or e-mail) are encrypted
 2. Integrity - Digital signatures
 3. Compression
 4. Public Key Infrastructure (PKI)
  a. Public key - used to encrypt data to a recipient
  b. Private key - used to decrypt data from a sender
 5. GPG is OpenPGP compliant

Usage:
 1. gpg --list-keys - this enumerates keys in ~/
 2. gpg --gen-key - generates a PKI keypair for the current user

 3. gpg --encrypt -r LinuxCBT --armor sample.txt - encrypts sample.txt using our 'LinuxCBT's' public key

 4. gpg --decrypt sample.txt.asc
 5. gpg --decrypt sample.txt.gpg
 6. gpg --export -a - dumps public key to STDOUT
 7. gpg --import - waits on STDIN for user to paste a key for import
 8. gpg --decrypt -o sample.txt sample.txt.gpg