Password Security Guide: Create Strong Passwords
By AllConvertor · · 2 min read
Most account breaches begin with a weak or reused password. The good news is that fixing this is straightforward. This guide explains what actually makes a password strong and how to manage dozens of them without going mad.
What makes a password strong
Password strength comes down to how many guesses an attacker would need, often measured in bits of entropy. Every extra character multiplies the number of possible combinations. A random 16-character password using upper- and lowercase letters, digits and symbols has roughly 105 bits of entropy, which is far beyond what brute-force attacks can realistically reach.
- Length matters most: aim for at least 14 to 16 characters for important accounts
- Randomness matters: patterns, names, dates and keyboard walks are guessed first
- Uniqueness matters: one password per site limits the damage of any single breach
Why length beats forced complexity
Current guidance such as NIST SP 800-63B favours longer passwords and checking against known breached passwords over arbitrary rules like 'must contain one symbol'. A passphrase made of four or more random words can be both strong and memorable, while 'P@ssw0rd1!' is weak despite meeting typical complexity rules.
Common mistakes to avoid
- Reusing the same password across email, banking and social media
- Using personal information such as birthdays, pet names or phone numbers
- Making small changes (Password1, Password2) when forced to rotate
- Storing passwords in plain notes, screenshots or spreadsheets
- Sharing passwords over chat or email
How a password generator helps
Humans are poor at randomness. A password generator uses a cryptographically secure random source to pick each character, producing passwords with no predictable pattern. Choose the length, select character types and copy the result straight into a password manager.
Use a password manager
A reputable password manager creates, stores and fills unique passwords for every account, so you only need to remember one strong master passphrase. It also helps you spot reused or breached passwords and fills credentials only on the genuine site, which protects against phishing.
Add a second layer: multi-factor authentication
- Turn on two-factor authentication (2FA) for email, banking and cloud storage first.
- Prefer an authenticator app, a hardware security key or a passkey over SMS codes where possible.
- Save your recovery codes in a safe place that is not your primary device.
- Review account recovery options, since attackers often target the reset flow.
What to do after a breach
If a service you use reports a breach, change that password immediately, change it anywhere else you reused it, and enable 2FA. Check whether your email appears in a breach-notification service, and watch for phishing messages that reference the incident.