🔐 What Makes a Password Strong? (Length Beats Complexity)

A password is strong when it is long (at least 14 characters), randomly generated, and unique to one account. Length matters more than complexity: a random 16-character password drawn from letters, digits and symbols has about 105 bits of entropy and would take billions of years to brute-force at a trillion guesses per second, while short "complex" passwords like P@ssw0rd! fall to dictionary attacks in seconds.

The math: entropy decides everything

Every added character multiplies the number of possible combinations. An 8-character password from a 94-symbol set has roughly 6 quadrillion combinations — crackable in days by a modern GPU rig. Sixteen characters pushes that to billions of years. This is why security experts now recommend long passphrases or generated passwords over short clever ones.

Why "P@ssw0rd!" style passwords fail

Attackers do not guess randomly; they use leaked password databases and rule-based mutations — swapping a for @, adding ! or a year. Any password a human invents follows patterns that cracking tools try first. Random generation removes the pattern entirely.

A practical password system

Use a password manager and generate a unique random password of 16+ characters for every account. Protect the manager itself with a long passphrase of five or more random words, and turn on two-factor authentication for email and banking. Check any password you still type by hand with the Password Strength Checker.