2025 was a significant year for data breaches, with several major incidents exposing hundreds of millions of user credentials. Here is what happened and — more importantly — what you should do to protect yourself.
Why Data Breaches Keep Happening
Data breaches occur when attackers gain unauthorised access to a company's database and steal user records — typically including email addresses, usernames, and hashed (or in some cases plaintext) passwords. The root causes are usually misconfigured servers, unpatched vulnerabilities, phishing attacks on employees, or third-party supply chain compromises.
What Happens to Your Password After a Breach
When a site is breached, passwords are usually stored as cryptographic hashes — not plaintext. However, attackers use "cracking" techniques to reverse weak hashes:
- Dictionary attacks: Testing millions of common passwords and their hashes
- Rainbow tables: Pre-computed tables matching hashes to plaintext passwords
- GPU brute force: Modern graphics cards can test billions of hashes per second
Short, common, or pattern-based passwords are recovered within minutes to hours. Long, random passwords — like those generated by our tool — can take thousands of years even with modern hardware.
What To Do If Your Data Was Breached
- Change the password immediately on the breached service
- Change it everywhere you reused it — this is why unique passwords matter
- Enable 2FA on the account if not already active
- Monitor for suspicious activity — unusual logins, unknown devices, unexpected emails
- Check other accounts using our Email Breach Checker
The Best Long-Term Defence
Breaches are largely outside your control — companies get hacked. But their impact on you is entirely within your control: use a unique, randomly generated password for every account, stored in a password manager. When a site is breached, only that one account is at risk — not your email, bank, or social media.
Generate a new strong password now with our free password generator.
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