Madison Gurkha - A consultancy firm based in The Netherlands providing penetration testing and auditing and subsequent threat mitigation services. Signal Networks Ltd - Provides ethical hacking, assessments and security services. ECSC Group PLC - Providing varying levels of network security audits. Acros Security - Slovenian business dedicated to locating security problems in network systems software and hardware. Pure Hacking Pty Ltd - Dedicated penetration testing services focusing on network application and Internet security. Tevora - A Lake Forest, California USA based company that provides assessment, audit, and vulnerability testing as well as firewalls, VPN solutions, and managed services. mwr InfoSecurity - Provide penetration testing, web application testing, vulnerability assessments, continuous security verifications, wireless security testing, firewall testing, security policy development, and CESG CHECK. Sec-Tec Limited - Provides product independent digital security services, specialising in penetration testing, technical training and core security consulting. Located in London, England. Greyhat, LLC. - Specializes in penetration testing, vulnerability assessments, network, commerce and business security, intrusion detection and response, risk mitigation, and consulting services. NTA Monitor Ltd. - Specializes in perimeter and penetration testing. Offers facts sheets, and security bulletins. Based in the UK. ProCheckUp Limited - MasterCard SDP compliant penetration and application security testing firm based in the United Kingdom. Offers articles, service information and contact details. CrossGroup Security - IT security and risk management service provider providing penetration, wireless security and web application testing, vulnerability assessments, config reviews. Aptive - UK company offering cyber security consultancy, vulnerability assessments, network security audits and web application penetration testing.