22 Chapter 1
repository. Write it backward on your forehead so it appears
forward in the rear-view mirror of the guy you’re tailgating. Let
anyone, anyone at all, use that key.
Public-Key Encryption
No problem. The only possible use for that key is to encrypt
messages that can be unencrypted only with the matching key
that you kept or to decrypt messages encrypted by your key.
People can encrypt messages that only you can read and can
decrypt messages that only you could have sent. This is the
whole basis behind public-key encryption. The published key is
called the public key, whereas the key you keep is the private key.
Together, a public key (key A) and its corresponding private
key (key B) are called a keypair.
Every OpenPGP user has a personal ...