The Monkeysphere enables you to use the OpenPGP web of trust to verify ssh connections. SSH key-based authentication is tried-and-true, but it lacks a true public key infrastructure for key certification, revocation, and expiration. Monkeysphere is a framework that uses the OpenPGP web of trust for these PKI functions. It can be used in both directions: for users to get validated host keys, and for hosts to authenticate users.