How to Create Strong Passwords: A Practical Guide

· 6 min read

Why Most Passwords Are Terrible

The most commonly used passwords are still "123456", "password", "qwerty" and "abc123". These can be cracked in under a second. Even passwords that feel clever — like "P@ssw0rd!" or "Summer2025" — follow predictable patterns that attackers know to look for.

The real problem isn't just weak passwords — it's password reuse. When one service gets breached (and they do, regularly), attackers try those credentials on every other service. If you use the same password for your email and your bank, a breach at a random forum puts your bank account at risk.

What Makes a Password Strong?

Password strength comes down to entropy — how many possible combinations an attacker would need to try. Three factors increase entropy:

Password TypeExampleTime to Crack
6 lowercase lettersabcdefInstant
8 mixed case + numbersaB3dEf7h~1 hour
12 all character typeskQ7#mP2&xL9!~34,000 years
16 all character typesRw4$nK8@vP2#bM6!Billions of years
4-word passphrasecorrect-horse-battery-staple~550 years

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The Best Strategy: Password Manager + Random Passwords

The practical solution is to use a password manager (like Bitwarden, 1Password or Apple's built-in Keychain) combined with randomly generated passwords. Here's the approach:

  1. Create one very strong master password — a long passphrase you can memorise, like "purple-elephant-dances-on-saturn-42"
  2. Generate unique random passwords for everything else — 16+ characters, all character types
  3. Let the password manager remember them — you only need to remember the master password
  4. Enable two-factor authentication on every account that supports it

Passphrase Method

If you need to memorise a password (for your master password or a work login), use a passphrase: 4-6 random words strung together. "correct-horse-battery-staple" is famously strong despite being memorable. The key is that the words must be truly random — don't use phrases from songs, books or common sayings.

Common Mistakes to Avoid

Two-Factor Authentication

Even the strongest password can be phished or leaked in a breach. Two-factor authentication (2FA) adds a second layer: something you have (your phone) in addition to something you know (your password). Use an authenticator app (Google Authenticator, Authy, Microsoft Authenticator) rather than SMS — SMS codes can be intercepted via SIM-swapping.

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