mutual authentication

Two-way authentication that enables a client to validate itself to a server and for the server to validate itself to the client. If an initiator and a target negotiate during login to use authentication, by default, the initiator authenticates to the target that it is who it says it is given that the initiator knows the target Challenge Handshake Authentication Protocol (CHAP) secret. If the initiator optionally requests mutual authentication, then the target authenticates to the initiator that the target is who it says it is given that the target knows the initiator’s CHAP secret.