The Point-to-Point Protocol (PPP) [9] is an IETF standard for
multiplexing the datagrams of multiple network protocols over a
point-to-point link. Like several other standards, PPP has
undergone constant revision and evolution since its inception,
including the addition of cryptographic security mechanisms.
Although mechanisms for authentication and con dentiality were
present in the original drafts of PPP, these mechanisms have
been signi cantly revised and expanded in later documents. In
particular, RFC 2716 [1] proposes a way in which theTransport
Layer Security (TLS) protocol [3] can be used to secure a PPP
connection.
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