Reverse CHAP protocol can be used to allow an iscsi target to authenticate to the iscsi initiator.
CHAP might be mutual or one-way (unidirectional) (bidirectional). When the target confirms the identity of the initiator, CHAP is used. In mutual or reverse CHAP, the initiator authenticates the target first, followed by the target's authentication. Target authentication is not necessary to establish initiator authentication. Point-to-Point Protocol (PPP) servers employ CHAP (Challenge-Handshake Authentication Protocol), a challenge-response authentication technique, to confirm the identity of a remote user.
PPP with CHAP is supported by the majority of network access servers and almost all network operating systems. CHAP is also used in PPPoE for DSL user authentication.
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