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Authentication Protocols

Various authentication protocols are listed and described below.
  • CHAP - Challenge Handshake Authentication Protocol is a three way handshake protocol which is considered more secure than PAP. Authentication Protocol.
  • EAP - Extensible Authentication Protocol is used between a dial-in client and server to determine what authentication protocol will be used.
  • PAP - Password Authentification Protocol is a two way handshake protocol designed for use with PPP. Authentication Protocol Password Authentication Protocol is a plain text password used on older SLIP systems. It is not secure.
  • SPAP - Shiva PAP. Only NT RAS server supports this for clients dialing in.
  • DES - Data Encryption Standard for older clients and servers.
  • RADIUS - Remote Authentication Dial-In User Service used to authenticate users dialing in remotely to servers in a organization's network.
  • S/Key - A one time password system, secure against replays. RFC 2289. Authentication Protocol.
  • TACACS - Offers authentication, accounting, and authorization. Authentication Protocol.
  • MS-CHAP (MD4) - Uses a Microsoft version of RSA message digest 4 challenge and reply protocol. It only works on Microsoft systems and enables data encryption. Selecting this authentification method causes all data to be encrypted.
  • SKID - SKID2 and SKID3 are vulnerable to a man in the middle attack. 

http://www.comptechdoc.org/independent/networking/protocol/protauthen.html

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