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Home / Glossary / CHAP
Glossary · Protocol

CHAP

Challenge Handshake Authentication Protocol

In plain language

A sign-in method where the server sends a puzzle and the user's device answers it, so the password never travels.

The metaphor

Like a guard who asks a question only someone with the secret can answer, and asks a new one each time.

Going deeper

How it works

  • The server sends a random challenge.
  • The device answers using the secret.
  • The server checks the answer.
  • Repeated during the session.

How WILDCARD handles it

Network covers the firewall and remote-access settings where such methods are chosen.

In practice
  • An older link uses it.
  • A router offers it in the settings.
  • An audit recommends a newer method.

A question owners ask

Is it secure?

It is better than sending a password, though newer methods are stronger.

Where WILDCARD handles this
Network
  • Firewall managed and monitored
  • Switches kept current
  • On-prem Active Directory auth
Start with Network
Related terms
ACLAccess Control ListAHAuthentication HeaderAPAccess PointARPAddress Resolution ProtocolBPDUBridge Protocol Data UnitCCMPCounter Mode/CBC-MAC ProtocolCCTVClosed-circuit TelevisionCSUChannel Service Unit

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