Penetration testing (Computer security) Security measures 43 Computer networks 42 Computer security 38 Hacking 24 Access control 8 Examinations 8 Testing 8 Certification 6 Hackers 6 Computers 5 Computer software 4 Evaluation 4 COMPUTERS 3 Electronic data processing personnel 3 General 3 Security 3 Telecommunications engineers 3 Internet 2 Python (Computer program language) 2 Web applications 2 Web sites 2 Application program interfaces (Computer software) 1 Automated vehicles 1 Business enterprises 1 Cyber intelligence (Computer security) 1 Cyberspace 1 Embedded Internet devices 1 Internet of things 1 Medical care 1