How long does it take to brute force a password?

It depends on password length and complexity. A six-character lowercase password can be cracked in seconds. An eight-character mixed-case password with numbers takes hours. A 12-character password with symbols, numbers, and mixed case would take centuries with current technology. Longer passwords are exponentially harder to crack.

Does MFA prevent brute force attacks?

MFA does not prevent the brute force attempt itself, but it renders a successful password guess useless because the attacker still needs the second factor (phone, hardware key, or biometric). This is why MFA is considered the single most effective defence against credential-based attacks.

What is credential stuffing?

Credential stuffing uses username-password pairs stolen from previous data breaches and tries them on other services. It works because many people reuse passwords across sites. Using unique passwords for every service (via a password manager) and enabling MFA are the best defences against credential stuffing.

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Brute Force Attack

Also known as:password crackingcredential attackexhaustive search attack

A cyberattack method that uses trial and error to guess passwords, encryption keys, or login credentials by systematically attempting every possible combination until the correct one is found.

In-Depth Explanation

A brute force attack is a cryptographic hack that relies on systematically trying every possible combination of characters to crack passwords, encryption keys, or other credentials. While simple in concept, modern computing power makes these attacks a serious threat to weak passwords.

Types of brute force attacks:

Simple brute force: Trying every possible character combination sequentially
Dictionary attack: Using a list of common words and passwords
Credential stuffing: Using stolen username-password pairs from previous breaches
Reverse brute force: Starting with a known password and trying it against many usernames
Hybrid attack: Combining dictionary words with common modifications (e.g., Password123!)
Rainbow table attack: Using precomputed hash tables to crack password hashes

Attack speed factors:

Password length and complexity
Hashing algorithm used (bcrypt is much slower to crack than MD5)
Attacker's computing resources (GPUs, cloud computing)
Whether rate limiting is in place
Salted vs unsalted password hashes

Defence strategies:

Enforce strong password policies (minimum 12 characters, complexity requirements)
Implement account lockout after failed attempts
Use rate limiting and CAPTCHA on login pages
Deploy multi-factor authentication (MFA)
Use strong hashing algorithms (bcrypt, Argon2) with salting
Monitor for unusual login patterns
Consider passwordless authentication options

Business Context

Brute force attacks remain one of the most common attack methods. Weak passwords can be cracked in seconds with modern tools. Implementing strong password policies and MFA effectively neutralises this threat.

How Clever Ops Uses This

Clever Ops protects Australian businesses against brute force attacks by implementing strong authentication policies, MFA, account lockout mechanisms, and login monitoring. We configure systems to detect and block automated login attempts before they succeed.

Example Use Case

"An Australian business discovers thousands of failed login attempts against their web portal. They implement rate limiting, CAPTCHA, and mandatory MFA, completely stopping brute force attacks on their systems."