A strong password is the first line of defense for any account. Studies show that over 80% of data breaches involve weak or stolen passwords. But how do you know if your password is truly secure?
What Makes a Password Strong
- Length — at least 12 characters. Each additional character exponentially increases brute-force time.
- Character variety — lowercase and uppercase letters, digits, special characters.
- Unpredictability — no dictionary words, dates, names, or sequences (123456, qwerty).
- Uniqueness — every service should have its own unique password.
Password Entropy
Entropy measures the amount of "randomness" in a password in bits. The formula is: H = L × log2(N), where L is the password length and N is the alphabet size. A 12-character password using the full alphabet (95 characters) has an entropy of ~79 bits — this is considered strong.
Conclusion
Check your password with our strength analyzer. To generate strong passwords, use the password generator.
