Simple mutual challenge-response password authentication


This diagram shows the following exchange of messages between a client and a server in a mutual challenge-response password authentication. The client sends 'Hello'; the server replies with a 'challenge' which incorporates the server ID; the client sends a response (that incorporates the client's user ID) and a 'counter-challenge'; the server concludes the exchange of messages with a response.

Related concepts
Authentication services

Related tasks
Using authentication for real-time connections

Related reference
Simple telnet-like password authentication