How to Create Secure Passwords: Why Length Beats Complexity

Password strength is about possibilities, not symbols

When someone tells you to use "uppercase, lowercase, numbers, AND symbols," they're giving you bad advice or at least incomplete advice. The real measure of password strength is how many possible passwords an attacker would have to try before guessing yours. That number depends on entropy, which is driven by length far more than by character variety.

A 15-character password made of nothing but common words is stronger than an 8-character password packed with symbols. Here's why.

How password cracking actually works

Hackers don't guess your password one try at a time while you wait. Instead, they:

• Get a stolen database with hashed passwords (not the passwords themselves)
• Run billions of guesses through the hash function offline, checking if the result matches
• Modern computers can try 10+ billion hashes per second on GPUs

At that scale, what matters is how many total possibilities exist, not how "complicated" each character is.

Entropy: the math behind strength

Password entropy is measured in "bits." Each character adds a certain number of bits based on the character set size:

• 8-bit character set (lowercase only): 1 character = 8 bits
• 36-character set (lowercase + numbers): 1 character 5.2 bits
• 94-character set (lower, UPPER, numbers, symbols): 1 character 6.5 bits

A "secure" password is generally considered 80+ bits of entropy (roughly uncrackable in reasonable time with current hardware).

Compare these two:

Password A: "BlueCat7@#$X2k" (14 chars, mixed case + symbols + numbers)
Entropy 14 6.5 91 bits

Password B: "correct horse battery staple" (28 chars, lowercase only, with spaces)
Entropy 28 4.7 132 bits

Password B is stronger, even though it looks weaker at first glance it uses only lowercase letters and spaces, yet has much higher entropy because it's longer.

The practical strategy

Use a password manager to generate and store truly random passwords for important accounts. For passwords you need to remember, prioritize length: aim for 15+ characters minimum. The character variety still matters for the remaining accounts, but length is the multiplier that drives actual security.

And don't reuse passwords across sites. If one database is compromised, an attacker tries that password everywhere else you use it and they will find hits.