GPG

Import keys from a public server:
gpg --keyserver pgp.mit.edu --search-keys <email>


gpg v1

Encrypt messages #1:

echo "hello" | gpg --symmetric --armor --passphrase "asdf" > message

cat message | gpg

Encrypt messages #2:
gpg --encrypt --armor <filename>
gpg --decrypt --armor <filename>

How to GPG:
brew install gnupg

gpg --list-secret-keys
gpg --list-public-keys

gpg --gen-key


gpg v2

brew install gnupg2
echo "hello" > message
gpg -se -ar "Name Surname" message
gpg -se -ar <long key> message
echo "hello" | gpg -e -ar <long key>
gpg -d message.asc

gpg --list-keys
gpg --keyserver pgp.mit.edu --receive-keys <long key>