Password security is the first and most important line of defence against account compromise, identity theft, and data breaches. Despite decades of warnings, password reuse and weak passwords remain the most common causes of security incidents worldwide. This guide covers everything you need to know to protect yourself in 2024.
> Quick tool: Use our free [Password Generator](/tools/password-generator) to create cryptographically random, strong passwords instantly — right in your browser.
Why Passwords Are Still Critical
You might assume that modern technology — biometrics, hardware keys, two-factor authentication — has made passwords obsolete. It has not. Passwords remain the primary authentication mechanism for the vast majority of online accounts. Even when you use Google or Apple to sign in, there is a password behind that account.
The scale of the problem is staggering. The "Have I Been Pwned" database tracks billions of compromised credentials from thousands of data breaches. Studies consistently show that the most common passwords include "123456", "password", and "qwerty" — choices that an attacker can crack in under a second.
What Makes a Password Strong?
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Security researchers and standards bodies, including NIST (the US National Institute of Standards and Technology), have updated their guidance significantly over the past decade. Here is what actually matters:
Length is the most important factor. A 16-character password of random words is far stronger than an 8-character password with complex symbols. Every additional character multiplies the number of possible combinations exponentially. A 12-character password has roughly 95¹² possible combinations — that is over 540 quadrillion possibilities.
Randomness matters more than complexity. The old advice to replace letters with numbers (like "p@ssw0rd") is largely useless — attackers account for these substitutions in their dictionary attacks. True randomness, achieved by a [password generator](/tools/password-generator), is far harder to crack than a human-constructed "complex" password.
Avoid predictable patterns. Birthdates, pet names, favourite sports teams, and keyboard patterns like "qwerty123" are among the first things attackers try.
Never reuse passwords. If any service you use suffers a breach, attackers will immediately try those credentials on other popular services. This attack, known as credential stuffing, is responsible for the vast majority of account compromises.
The NIST Password Guidelines
NIST SP 800-63B changed the conventional wisdom on passwords. Key recommendations include:
- Minimum length of 8 characters (longer is strongly encouraged)
- No mandatory complexity rules — forcing users to add symbols produces weaker passwords
- No mandatory periodic changes — unless there is evidence of compromise
- Check against known breached password lists — block commonly used passwords
- Allow all printable characters including spaces — passphrases are highly recommended
Password Managers: The Real Solution
The only practical solution to the password problem is a password manager. A good password manager generates a unique, random, long password for every account and stores it in an encrypted vault. You need to remember only one strong master password.
Leading password managers include:
- Bitwarden (open source, free tier available)
- 1Password
- Dashlane
- Apple iCloud Keychain / Google Password Manager
All of these generate strong random passwords, auto-fill credentials on login forms, warn you about reused or compromised passwords, and sync across devices securely.
Two-Factor Authentication
Even the strongest password can be compromised if a service has a server-side breach or if you are tricked by a phishing attack. Two-factor authentication (2FA) adds a critical second layer of protection.
TOTP authenticator apps (like Authy or Google Authenticator) generate time-based one-time codes. These are significantly more secure than SMS-based 2FA, which can be intercepted via SIM swapping attacks.
Hardware security keys (like YubiKey) provide the strongest 2FA available. They are phishing-resistant because they verify the domain of the site before responding.
SMS 2FA is better than no 2FA but should not be relied upon for high-value accounts.
Enable 2FA on every account that supports it, prioritising email, banking, social media, and any account linked to a payment method.
Password Requirements for Developers
If you are building an application that handles user authentication, you are responsible for implementing password security correctly:
- Hash passwords with bcrypt, scrypt, or Argon2 — never MD5 or SHA-256, which are too fast and unsuitable for password hashing. Learn more in our [MD5 vs SHA-256 guide](/blog/md5-sha256-difference).
- Use a unique salt per password — good libraries handle this automatically.
- Implement rate limiting and account lockout to prevent brute-force attacks.
- Check against breached password lists using the HaveIBeenPwned API at registration time.
- Never store plaintext passwords or use reversible encryption.
Passphrases: A Human-Friendly Alternative
A passphrase is a sequence of random words — like "correct-horse-battery-staple" — that is long enough to be secure but easier to remember than a string of random characters. At four random words, a passphrase has roughly 2⁵¹ combinations using a 7776-word wordlist. That is more than sufficient for most purposes.
Passphrases work best as master passwords for password managers, encryption keys, and credentials you must type regularly. For individual website accounts, use a [password generator](/tools/password-generator) with full randomness.
How to Audit Your Current Passwords
1. Check whether your email addresses have been compromised at haveibeenpwned.com.
2. Review your accounts in your password manager — most show a security audit highlighting reused, weak, or compromised passwords.
3. Prioritise changing passwords for: your email account, your bank, your password manager, and social media.
Frequently Asked Questions
Q: How long should a strong password be?
Security experts recommend at least 12–16 characters for standard accounts and 20+ for high-value accounts like email and banking. Our [Password Generator](/tools/password-generator) lets you set any length from 8 to 128 characters.
Q: Is a random password better than a passphrase?
Both are excellent when properly generated. A random 16-character password using all character types and a 4-word passphrase from a large wordlist offer comparable security. The passphrase is easier to remember; the random password is shorter.
Q: Can I use the same strong password on multiple sites?
No — never reuse passwords regardless of their strength. If one site is breached, credential stuffing attacks will test your password on every other major site automatically.
Q: Are browser-saved passwords safe?
Modern browsers like Chrome, Firefox, and Safari encrypt saved passwords and offer breach-detection alerts. They are significantly better than reusing passwords, though a dedicated password manager offers more features and stronger security guarantees.
Conclusion
Password security is not glamorous, but it is foundational. A strong, unique password for every account — managed by a reputable password manager — with 2FA enabled on critical accounts will protect you against the vast majority of attacks. [Use ToolHub's free Password Generator](/tools/password-generator) to create cryptographically random passwords of any length and complexity — entirely in your browser, with zero data stored.