• Phil Zimmerman made PGP, GnuPG is the open source alternative
• Full public/private key encryption system
• gpg --gen-key generates keys
• trading public keys...
  gpg --export --armor "My Name" > pubkey
• gpg --import pubkey.file
  Import the public key that you have received
• gpg --encrypt somefile.txt
  when asked for user ID, type the person's name
• gpg --decrypt somefile.txt.gpg

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