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Adding local short description: "Type of cryptographic protocol", overriding Wikidata description "type of cryptographic protocol specifically designed for transfer of authentication data between two entities" (Shortdesc helper) |
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===Authentication protocols developed for PPP [[Point-to-Point Protocol]]===
Protocols are used mainly by [[Point-to-Point Protocol]] (PPP) servers to validate the identity of remote clients before granting them access to server data. Most of them use a password as the cornerstone of the authentication. In most cases, the password has to be shared between the communicating entities in advance.<ref>{{cite document|title = Public-key cryptography and password protocols|last = Halevi|first = Shai| year=1998 | pages=230–268 |citeseerx = 10.1.1.45.6423}}</ref>
[[File:PAP 2way handshake.png|thumb|PAP 2-way handshake scheme|461x461px]]
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