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Glossary

Brute-Force Attack: Understanding & Preventing It

Everything about brute-force attacks: how they work, typical vulnerabilities they exploit and effective protective measures for your systems and accounts.

Definition: What is a brute-force attack? In a brute-force attack, attackers try every possible password or key, one after the other. Their goal is to break into a system without permission. These attacks are simple, but they often work, mainly when people use weak passwords.

How does a brute-force attack work?

A brute-force attack uses the raw power of computers. It tries out every possible mix of login data. The attack often starts with the most common passwords or with a dictionary attack. Then it works through all other options, one by one. The more complex the password, the longer a brute-force attack takes to succeed.

Typical brute-force vulnerabilities

  • Weak passwords and passwords that many people use
  • No account lockout after many failed tries
  • Too little monitoring of login activity

Protective measures against brute-force attacks

  • Use strong, complex passwords
  • Lock accounts after several failed login tries
  • Use multi-factor authentication (MFA)
  • Watch and log login attempts, so you can spot and react to odd activity

Strong passwords

A strong password has at least 12 to 16 characters. It mixes letters, digits and symbols. Avoid common words and facts that are easy to guess, such as dates of birth or names.

Account lockout mechanisms

After a set number of failed login tries, the account should be locked for a while. This makes a brute-force attack less likely to succeed.

Multi-factor authentication (MFA)

MFA adds one more layer of security. Users need more than just a password to log in. The second factor can be a code sent to a mobile phone. It can also be a biometric check, such as a fingerprint or face scan.

Tools for defending against brute-force attacks

Many security tools can detect and stop brute-force attacks. These tools can help you spot and block such attacks:

  • web application firewalls (WAF)
  • intrusion detection systems (IDS)
  • intrusion prevention systems (IPS)

Conclusion

Brute-force attacks are a threat to IT security that does not go away. Companies can lower the risk with strong safeguards. They should also check their security practices on a regular basis. Key ways to guard against a brute-force attack are strong passwords, MFA, account lockouts and constant monitoring.

🔒 Have your systems tested for brute-force weak spots: check now

📌 Related terms: Dictionary attack, credential stuffing

Best practices for protecting against brute-force attacks

Good protection against a brute-force attack combines several steps. These practices have proven to work well:

  • Password policy: Promote long passphrases. Check new passwords against lists of known leaked passwords. Allow the use of password managers.
  • MFA for critical access: Protect services that can be reached from outside with multi-factor authentication. This applies above all to VPN, email, remote access and admin accounts.
  • Limit login attempts: Rate limits, longer waits after each failed try and short lockouts make automated guessing harder.
  • Reduce the attack surface: Do not expose services such as RDP or SSH directly to the internet. Always change default passwords.
  • Secure password storage: Store passwords only as salted hashes. Use slow algorithms built for this, such as bcrypt or Argon2. That makes offline attacks on stolen hashes harder.

Common challenges and solutions

  • Abuse of account lockouts: Attackers can trigger lockouts on purpose to lock users out. Short lockouts, not lasting ones, and growing delays lower this risk.
  • Distributed attacks: Blocking by IP address alone does not stop password spraying or attacks from many IP addresses. It helps to detect attacks per account and analyze them in one central place.
  • Usability: Rules that are too strict make people look for ways around them. Password managers, single sign-on and easy MFA methods help users accept the rules.

Measuring success and KPIs

You should be able to measure how well your safeguards work. Useful metrics include:

  • Number of brute-force attempts detected and blocked
  • Share of accounts with MFA turned on
  • Share of weak or leaked passwords found in reviews
  • Time it takes to respond to alerts about suspicious logins

Your next step

Good protection against a brute-force attack keeps access to your systems and data safe. Our experts help you secure your logins in a way that fits your needs.

Get started today:

  • 📞 Free consultation: Book a talk with no strings attached
  • 📋 Security assessment: Let us check your login process and access points
  • 🎯 Tailored solution: We build a plan just for you to guard against brute-force attacks
  • 🚀 Implementation: We put it in place and keep supporting you

Contact us today and take the first step toward a safer digital future.

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