Password Strength Guide

Password strength depends on randomness, length, uniqueness, and the size of the character pool. A random password generated by software is usually safer than a memorable password invented by a person.

Entropy and search space

Entropy estimates how difficult it is to guess a password by brute force. More possible combinations mean a larger search space. Increasing length is often the most reliable way to increase strength.

Why uniqueness matters

Even a strong password becomes risky if it is reused. If one website is breached, attackers may try the same password on email, banking, social, and work accounts. Unique passwords limit that damage.

Practical recommendations

• Use random passwords of at least 16 characters for everyday accounts.
• Use longer passwords for email, financial accounts, and administrator access.
• Use passphrases for secrets you must type manually.
• Enable multi-factor authentication for important accounts.