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Glossary · Security

CFB

Cipher Feedback

In plain language

A method of scrambling data a few characters at a time, so it can be used on a live stream.

The metaphor

Like a stenographer who scrambles each word as it is spoken, keeping pace with the speaker.

Going deeper

How it works

  • Turns a block cipher into a stream.
  • Feeds earlier output back into the next step.
  • Used in older systems.
  • Modern setups use other modes.
In practice
  • An older protocol lists it.
  • A tool needs it for compatibility.
  • An audit notes it as legacy.

A question owners ask

Does it matter to me?

Almost never. It is a setting inside software.

Related terms
AAAAuthentication, Authorization, and AccountingAccount takeoverACLAccess Control ListAdmin accountAESAdvanced Encryption StandardAES-256Advanced Encryption Standards 256-bitAISAutomated Indicator SharingAPTAdvanced Persistent Threat

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