Definition: password

A secret word used to serve as a security measure against unauthorized access to data. Typically combined with username, a password is used to log onto a computer, mobile device, network or website or to activate newly installed software. However, without additional measures such as biometric identification, the computer can only verify the legitimacy of the password, not the legitimacy of the user (see biometrics).

Passphrase, Passcode and PIN
"Passphrase," "passcode" and "PIN" are password synonyms. However, "key" is incorrect because a key is part of an encryption system. For example, a "passkey" refers to a system that totally eliminates passwords (see FIDO).

How Secure Is Your Password?
Type your password into Security.org and find out (see password security check). See PIN, one-time password, password manager, public key cryptography, password spraying and NCSC.

Password Tips from the NCSC
The following password safety tips are from the U.S. National Counterintelligence and Security Center (NCSC):

1. CHANGE PASSWORD FREQUENTLY - The longer you use a password, the higher the risk.

2. USE GOOD PASSWORDS - Do not use persons, places or things that can be identified with you.

3. DON'T DISCLOSE YOUR PASSWORD - Your password is as valuable as the information it protects.

4. INSPECT YOUR DATA - If you suspect someone has tampered with your files, report it immediately.

5. NEVER LEAVE AN ACTIVE TERMINAL UNATTENDED - Always log out or lock your terminal before leaving.

6. REPORT SUSPECTED COMPUTER ABUSE - Whether directed against you or not, abuse or misuse of your computer resources only hinders the timely completion of your tasks.

How Strong Is Your Password?

This password example would take 158 thousand years for regular computers to figure out. Go to HowSecureIsMyPassword and check yours.