Kali Linux Penetration testing (Computer security) 30 Computer networks 15 Computer security 14 Security measures 14 Hackers 8 Access control 7 Computers 6 Hacking 5 Operating systems (Computers) 5 Computer crimes 4 Investigation 4 Testing 3 Computer software 2 Evaluation 2 Amazon Web Services (Firm) 1 Application software 1 Computer programming 1 Data protection 1 Internet 1 Linux 1 Metasploit (Electronic resource) 1 Microsoft Windows (Computer file) 1 Open Source 1 Open source software 1 Passwords 1 Security 1 Social engineering 1 Systems and Data Security 1 Web applications 1