Authentication hygiene is the set of basic practices that help verify user and device identity securely. It includes using strong passwords, multi-factor authentication, unique credentials, secure password resets, session timeouts, and regular review of accounts, tokens, and device trust. The goal is to make it harder for an attacker to impersonate a legitimate user or machine.
It matters because many breaches begin with stolen credentials, phishing, password reuse, or abused login sessions. Good authentication hygiene reduces the value of compromised passwords and limits how far an intruder can move once inside. In real defenses, teams enforce MFA, block weak or reused passwords, retire inactive accounts, monitor unusual logins, and recheck trusted devices. In attacks, criminals often look for poor hygiene first, since one weak login can expose email, cloud services, and internal tools.