Simulating attacks in order to determine network vulnerabilities. 1. Covert Systems - Specializes in network penetration analysis, systems configuration and managed services. 2. Digital Defense Inc. - Offers a range of penetration testing and vulnerablity assement services as well as policy development and security management. 3. Hacksafe Pty Ltd - Provides penetration testing and vulnerability assessment services, virus testing services, education and training. 4. Ilion Security SA - Ethical hacking and computer security training. Geneva, Switzerland. 5. mwr InfoSecurity - Provide penetration testing, web application testing, vulnerability assessments, continuous security verifications, wireless security testing, firewall testing, security policy development, and CESG CHECK. 6. Phoenix IT Solutions, LLC: - Offers several security auditing packages include risk assessment and penetration testing. Based in Washington, DC, USA 7. ProCheckUp Limited - MasterCard SDP compliant penetration and application security testing firm based in the United Kingdom. Offers articles, service information and contact details. 8. Pure Hacking Pty Ltd - Dedicated penetration testing services focusing on network application and Internet security. 9. Remote Vulnerability Assessment Solutions, Inc. - RVASI provides services and solutions globally. Specializes in web application vulnerability assessments. 10. SafeTake - Provides application level security testing services. 11. Sec-Tec Limited - Provides product independent digital security services, specialising in penetration testing, technical training and core security consulting. Located in London, England. 12. Tevora Business Solutions - An Irvine, California USA based company that provides assesment, audit, and vulnerability testing as well as firewalls, vpn solutions, and managed services. 13. Acros Security - Slovenian business dedicated to locating security problems in network systems software and hardware. 14. E-Commerce Security Consultants - Providing varying levels of network security audits. 15. Exact Consulting - Offers assessments, testing, policy creation and review as well as regulatory compliance and alignment programs. 16. Greyhat, LLC. - Specializes in penetration testing, vulnerability assessments, network, commerce and business security, intrusion detection and response, risk mitigation, and consulting services. 17. ITamon - Provides services for security, investigation, web security and ICT awareness. Specializes in penetration testing. 18. Madison Gurkha, - A consultancy firm based in The Netherlands providing penetration testing and auditing and subsequenet threat mitigation services. 19. NTA Monitor Ltd. - Specializes in perimeter and penetration testing. Offers facts sheets, and security bulletins. Based in the UK. 20. SecureCom UK Limited - Provides penetration and wireless security testing, vulnerability assessments, social engineering and full security audits. Based in South England. 21. Signal Networks Ltd - Provides ethical hacking, assessments and security services. 22. Tiburon Enterprises LLC. - Services include vunerability and compliance assessments, penetration testing, and executive advisory services.

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