Kerberos

Kerberos is a mechanism that allows for secure authentication over insecure links. By clever uses of encryption, information is passed back and forth about the user trying to authenticate which can verify their credentials without ever sending the actual password (or anything which can be used to determine it) over the transmission line. There's other benefits to Kerberos, which should be added here at some point. We're not running it currently, but once a few backend features are finished we just might be.