What Makes a Password Strong?
A password's strength is measured by how long it would take a computer to guess it. This depends on two factors: length and character variety.
Length is the single most important factor. Every extra character multiplies the number of possible combinations exponentially. An 8-character password has about 200 billion possible combinations if it uses letters, numbers and symbols. A 16-character password has trillions of trillions — practically unguessable by brute force.
Character variety means using a mix of: • Uppercase letters (A-Z) • Lowercase letters (a-z) • Numbers (0-9) • Special characters (!@#$%^&*)
A password using all four types with 12+ characters would take modern computers millions of years to crack by brute force.
Common Password Attack Methods
Understanding how hackers crack passwords helps you understand why strong passwords matter.
Brute force attacks: The computer tries every possible combination of characters. This is why length matters so much — each character added makes brute force exponentially slower.
Dictionary attacks: Instead of random characters, the attacker tries common words, names, and known passwords. "Password", "dragon", "iloveyou" — these are the first words tried. Any real word or name is vulnerable.
Credential stuffing: When a website is hacked and passwords are leaked, attackers try those same username/password combinations on other sites. If you reuse passwords, one breach compromises all your accounts.
Rainbow table attacks: Pre-computed tables of common password hashes are used to instantly identify simple passwords. This is why websites should use salted hashing (bcrypt, Argon2) — it defeats rainbow tables.
Phishing: The attacker tricks you into entering your password on a fake website. No password strength protects against phishing — which is why two-factor authentication (2FA) is essential.
The Rules for Truly Secure Passwords
Follow these rules for every password you create:
- 1Minimum 16 characters — 12 is the old advice. With today's GPU-accelerated cracking, 16 is the new minimum for important accounts.
- 1Never use real words or names — "Fluffy2024!" is not a strong password. It contains a word, a year and a symbol — exactly what attackers try first.
- 1Never reuse passwords — each account must have a unique password. Use a password manager to handle this.
- 1Avoid predictable patterns — "Password1!", "Qwerty123#", "Summer2026!" all follow patterns hackers know and try first.
- 1Use a password generator — random passwords are always stronger than human-created ones. Humans are predictable; true random generation is not.
- 1Enable 2FA everywhere — a strong password plus two-factor authentication means an attacker needs both your password AND your phone to break in.
Password Managers: The Right Solution
The real answer to password security is a password manager. No human can memorize 50 unique 16-character random passwords — and no human should try.
A password manager stores all your passwords in an encrypted vault protected by one strong master password. You only need to remember one password. The manager generates, stores and auto-fills unique strong passwords for every site.
Popular password managers include Bitwarden (free, open source), 1Password, Dashlane and LastPass. Most are available on all devices and browsers.
With a password manager: • Every account gets a unique 20+ character random password • You never type passwords manually (no risk of shoulder surfing) • Breaches on one site don't affect other accounts • You can share passwords securely with family or team members
The combination of a password manager + unique generated passwords + 2FA is the gold standard for personal security in 2026.