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Glossary · Security

IDEA

International Data Encryption Algorithm

In plain language

An older method for scrambling data that has mostly been replaced by newer standards.

The metaphor

Like an older safe model that still works but that most buildings have replaced.

Going deeper

How it works

  • It scrambles data in blocks using a long key.
  • It has no known easy break, but it was overtaken by AES.
  • It shows up in older software and some email encryption tools.
  • New products rarely choose it.
In practice
  • An older encryption tool lists it as an option.
  • A legacy archive was locked with it.
  • A compatibility list names it for old email tools.

A question owners ask

Should I use it?

No. Choose AES where you have the option. It rarely matters to a small business.

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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