Brute Force Attack

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