Wikipedia
Kerberos () is a computer-network authentication protocol that works on the basis of tickets to allow nodes communicating over a non-secure network to prove their identity to one another in a secure manner The protocol was named after the character Kerberos (or Cerberus) from Greek mythology, the ferocious three-headed guard dog of Hades Its designers aimed it primarily at a client–server model and it provides mutual authentication—both the user and the server verify each other's identity Kerberos protocol messages are protected against eavesdropping and replay attacks Kerberos builds on symmetric key cryptography and requires a trusted third party, and optionally may use public-key cryptography during certain phases of authentication
Kerberos (protocol) - Wikipedia, the free encyclopedia