Brute Force Attacks
What Is a Brute Force Attack?
A brute force attack systematically tries every possible combination of characters - or a list of common passwords - until it finds the correct credentials to gain unauthorized access.
Variations of Brute Force Attacks
Brute force attacks range from exhaustive, purely random guessing to more targeted approaches that dramatically improve an attacker's odds of success.
- Simple Brute Force - trying every possible character combination
- Dictionary Attack - trying a curated list of common passwords
- Credential Stuffing - reusing credentials leaked from other breaches
Why Weak Passwords Are Vulnerable
| Password Length | Approximate Time to Crack (illustrative) |
|---|---|
| 6 characters | Seconds to minutes |
| 8 characters (mixed) | Hours to days |
| 12+ characters (mixed) | Years, given current computing power |
Defenses Against Brute Force Attacks
Account lockouts after repeated failed attempts, rate limiting, multi-factor authentication, and enforcing strong password policies all significantly reduce the practicality of brute force attacks.
Brute force attacks exploit weak credentials, but some of the most dangerous attacks exploit something defenders don't even know exists yet - zero-day exploits.
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