DH-CHAPDiffie-Hellman Challenge Handshake Authentication Protocol (IETF)
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DH-CHAP is a variation of CHAP that adds a Diffie-Hellman exchange to both strengthen CHAP and provide an agreed-upon secret key.
DH-CHAP is the simplest of the authentication protocols.
DH-CHAP with a null Diffie-Hellman exchange is the mandatory protocol on which to base interoperability.