What is a backdoor in a computer system?

A secret way to bypass normal security.

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  1. A backup power supply
  2. A secret way to bypass normal security ✔
  3. A physical door on a server

Why: A backdoor lets someone skip authentication and access a system secretly.

Huh, didn't know that: A backdoor lets someone skip authentication and access a system secretly.

The dad joke
A backdoor is a secret tunnel into your data.
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References

Answer: A secret way to bypass normal security. A backdoor lets someone skip authentication and access a system secretly.

  1. Computer security en.wikipedia.org/wiki/Computer_security
    A backdoor in a computer system, a cryptosystem or an algorithm, is any secret method of bypassing normal authentication
    Checked 2026-11-07.

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