What is pentesting?

Pentesting is short for penetration testing. It’s when you try to hack into a system yourself to find security vulnerabilities before the bad guys do. Think of it like hiring a locksmith to test if your locks are strong enough by actually trying to pick them.

Companies hire pentesters, also called ethical hackers or white hat hackers, to attack their websites, apps, networks, and systems using the same techniques that real attackers would use. The difference is that pentesters have permission to do this, and they report every vulnerability they find so it can be fixed.

A typical pentest involves gathering information about the target, scanning for weaknesses, attempting to exploit those weaknesses to gain access, and then documenting everything found. Pentesters might try SQL injection, cross-site scripting, password cracking, social engineering, or dozens of other attack techniques.

The simple goal is to find the holes before attackers do. If a pentester can break in, a malicious hacker probably can too. The report from a pentest gives the company a prioritized list of what to fix, ranked by severity from critical to low.

Pentesting is different from a security audit or vulnerability scan. Audits check if you’re following security policies. Vulnerability scans automatically check for known issues. Pentesting is hands-on, creative, and often finds things automated tools miss.

When I was in high school I played around with pentesting tools like Metasploit. As a part of my professional job I’ve been a part of security training where we hacked our own site to find vulnerabilities.