In security protocols, a challenge is some data sent to the client by the server in order to generate a different response each time. Challenge-response protocols are one way to fight against replay attacks where an attacker listens to the previous messages and resends them at a later time to get the same credentials as the original message.
The HTTP authentication protocol is challenge-response based, though the "Basic" protocol isn't using a real challenge (the realm is always the same).
Learn more
- Challenge-response authentication on Wikipedia.
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Credits
- Source: https://developer.mozilla.org/en-US/docs/Glossary/challenge
- Published under Open CC Attribution ShareAlike 3.0 license