Password Security: How to Create Passwords That Can't Be Cracked
Published Apr 14, 2026 · 6 min read
The password "P@ssw0rd!" looks complex but takes seconds to crack. The passphrase "correct horse battery staple" takes centuries. Length beats complexity every time — here's the math and the strategy.
How Passwords Are Cracked
| Attack Type | Method | Speed |
|---|---|---|
| Brute force | Try every combination | Billions/second (GPU) |
| Dictionary attack | Try common words/passwords | Seconds for common passwords |
| Credential stuffing | Try leaked username/password pairs | Instant if you reused passwords |
| Phishing | Trick you into entering it | Bypasses password strength entirely |
The Math of Password Strength
Possible combinations = (character set size) ^ (length)
| Password Type | Charset | Length | Combinations | Crack Time (10B/sec) |
|---|---|---|---|---|
| Numbers only | 10 | 8 | 100 million | 0.01 seconds |
| Lowercase | 26 | 8 | 209 billion | 21 seconds |
| Mixed case + numbers | 62 | 8 | 218 trillion | 6 hours |
| All printable | 95 | 8 | 6.6 quadrillion | 7.6 days |
| All printable | 95 | 12 | 5.4 × 10²³ | 1.7 million years |
| 4-word passphrase | ~7,776 words | 4 words | 3.7 × 10¹⁵ | 4.2 days |
| 5-word passphrase | ~7,776 words | 5 words | 2.8 × 10¹⁹ | 90 years |
Adding 4 characters does more than adding symbols to a short password.
Best Practices
- Use a password manager: Generate unique 16-20 character passwords for every account. Remember one master password, the manager remembers the rest.
- Enable 2FA everywhere: Even a leaked password can't be used without the second factor (authenticator app > SMS).
- Use passphrases for memorable passwords: 4+ random words ("glass piano river sunset") beats "G!a5s#1".
- Never reuse passwords: One breach exposes every account with the same credentials.
- Check breaches: haveibeenpwned.com tells you if your email appeared in known data breaches.
What NOT to Do
- Don't rotate passwords on a schedule (leads to "Password1", "Password2"...)
- Don't write them on sticky notes at your desk
- Don't use personal info (birthday, pet name, address)
- Don't trust "security questions" — mother's maiden name is publicly available
Try it: Use our Password Generator to create cryptographically strong passwords instantly.