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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Challenge-response authentication - Glossary | MDN | 1/3 | https://developer.mozilla.org/en-US/docs/Glossary/Challenge | reference | web, html, css, javascript, documentation | 2026-05-05T05:27:14.858945+00:00 | kb-cron |
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Challenge-response authentication
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).
In this article
See also
- Challenge-response authentication on Wikipedia.