Password Security Guide
The complete guide to creating secure passwords, understanding attack methods, and protecting your accounts. Based on NIST guidelines and industry best practices.
Myths vs. Facts
Complex passwords (P@$$w0rd!) are more secure
Length matters more. 'correct horse battery staple' is stronger than 'Tr0ub4dor&3'
You should change passwords every 90 days
NIST no longer recommends forced rotation. Change only if compromised.
Special characters make passwords uncrackable
Attackers know common substitutions (@ for a, 3 for e). Length wins.
Password hints help you remember
Hints can leak info to attackers. Use a password manager instead.
Time to Crack by Password Length
Estimated times using modern hardware (2024). Assumes offline attack on unsalted hash.
| Length | Lowercase Only | Mixed Case + Numbers | With Symbols |
|---|---|---|---|
| 6 chars | Instant | Instant | 5 seconds |
| 8 chars | 5 minutes | 1 hour | 8 hours |
| 10 chars | 3 hours | 3 months | 5 years |
| 12 chars | 3 weeks | 200 years | 34,000 years |
| 14 chars | 51 years | 1 million years | Millennia |
| 16 chars | Millennia | Billions of years | Beyond time |
* Online attacks are much slower due to rate limiting. But once attackers have a database dump, they attack offline.
Common Attack Methods
Brute Force
high riskTry every possible combination
Speed: ~100 billion/sec (with GPU)
Defense: Use 16+ character passwords
Dictionary Attack
high riskTry common words and phrases
Speed: ~10 million/sec
Defense: Avoid dictionary words
Rainbow Tables
medium riskPre-computed hash lookups
Speed: Instant lookup
Defense: Sites should use salted hashes
Credential Stuffing
critical riskUse leaked passwords from other sites
Speed: Automated at scale
Defense: Never reuse passwords
Social Engineering
high riskTrick you into revealing password
Speed: Varies
Defense: Verify requests, use 2FA
Best Practices (2024)
Use a Password Manager
Generate and store unique passwords for every account. You only need to remember one master password.
Enable 2FA/MFA
Add a second factor (authenticator app, hardware key) so passwords alone aren't enough.
Use Passphrases
String 4-6 random words together: 'correct horse battery staple' is memorable and secure.
Check for Breaches
Regularly check if your passwords have been exposed in data breaches.
Password Hashing (For Developers)
Adaptive, slow by design, includes salt
Winner of 2015 Password Hashing Competition
Memory-hard, prevents GPU attacks
Older but still secure with high iterations
Too fast, no salt, cryptographically broken
External Resources
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