Stop Brute Force Attacks

TL;DR

Brute force attacks try lots of passwords to get into your accounts. This guide shows you how to make it much harder for attackers, using strong passwords, two-factor authentication, and tools to block suspicious login attempts.

How Brute Force Attacks Work

Attackers use software to automatically try many different username/password combinations. They hope one of them is correct. The faster they can try combinations, the more likely they are to succeed. We’ll focus on slowing them down and making it harder for them.

Steps to Protect Yourself

1. Use Strong, Unique Passwords
• Length: Aim for at least 12 characters. Longer is better!
• Complexity: Mix uppercase and lowercase letters, numbers, and symbols (e.g., !@#$%^&*).
• Uniqueness: Never reuse the same password on multiple websites or accounts. If one site gets hacked, all your accounts are at risk.
• Password Managers: Consider using a password manager like Bitwarden, 1Password, or LastPass to generate and store strong passwords for you.
2. Enable Two-Factor Authentication (2FA) Wherever Possible

2FA adds an extra layer of security. Even if someone guesses your password, they’ll also need a code from your phone or another device.

• Authenticator Apps: Google Authenticator, Authy, and Microsoft Authenticator are popular choices. They generate time-based codes.
• SMS Codes (less secure): Some services offer 2FA via text message. This is better than nothing but less secure than authenticator apps because SMS messages can be intercepted.
3. Limit Login Attempts

Many systems allow you to limit the number of failed login attempts before an account gets locked.

• Website/Service Settings: Check your website or service’s security settings for options like “Maximum Failed Login Attempts” or “Account Lockout”. Set a reasonable limit (e.g., 5-10 attempts).
• Fail2Ban (for servers): If you manage your own server, Fail2Ban is a powerful tool that automatically blocks IP addresses after too many failed login attempts. Install it using your server’s package manager:

  sudo apt update && sudo apt install fail2ban

  Configure it to monitor log files for failed logins and block offending IPs.

4. Use a CAPTCHA

CAPTCHAs (Completely Automated Public Turing test to tell Computers and Humans Apart) help distinguish between humans and bots. They’re often used on login forms.

• Google reCAPTCHA: A popular option for websites. It presents challenges that are easy for humans but difficult for bots.
5. Keep Software Updated

Software updates often include security patches that fix vulnerabilities attackers can exploit.

• Operating System: Regularly update your operating system (Windows, macOS, Linux).
• Web Applications: Keep your website’s software (WordPress, Joomla, Drupal) and plugins up to date.
6. Monitor Your Accounts for Suspicious Activity

Regularly check your account activity for logins from unfamiliar locations or devices.

• Login History: Most services provide a login history page.
• Email Alerts: Set up email alerts for new logins or password changes.