Glossary of Security Terms: Challenge-Response Authentication | Hacker Noon

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Mozilla (stylized as moz://a) is a free software community founded in 1998 by members of Netscape.

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).

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Mozilla (stylized as moz://a) is a free software community founded in 1998 by members of Netscape.

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