- Internet Security Systems
 - Provides products and services based on proactive security intelligence that protects against Internet threats and vulnerabilities. - Counterpane Internet Security
- Specializes in single-source enterprise security solutions and services for real time internal and external network protection of customers' information integrity.
- eEye Digital Security
- Develops network security software and provides vulnerability assessment services.
- Mitnick Security Consulting
- Contains news directly from Kevin, the most notorious hacker ever to be captured. Find out the truth behind the media hype and learn about the security consulting services he now offers.
- Cryptography Research
- Run by Paul Kocher, includes an extensive crypto resources section as well as information on academic research and commercial services.
- Defensive Thinking
- Information security company dedicated to helping people from government and business protect vital information. Funded by Kevin Mitnick and Alex Kasper.
- Valicert
- Develops and markets infrastructure software products to conduct secure transactions over the Internet.
- Password Crackers, Inc.
- Password cracking and recovery services.
- NetWolves
- Network continuity and security provider.
- beTRUSTed
- Addresses authentication and electronic identification, information integrity, transaction validation, and privacy concerns.
- Guardent
- Digital security services firm.
- Silk Road Group
- Next generation intrusion and fraud detection, including the design, architecture, due diligence, strategy, policy, and security of Internet services and internetworks.
- SystemExperts Corporation
- Security consulting firm that develops security architectures, performs penetration tests, develops security policies, provides interim security staff, and provides emergency response to attacks.
- Livermore Software Laboratories, INC
- PORTUS firewall and network security consultants.
- NETSEC
- Provider of managed network security services, focusing on firewalls and intrusion detection, information assurance, and intelligence services for international companies and government agencies.
- NTA Monitor
- Provides a range of internet security testing and auditing services to various companies across Europe.
- Trusted Systems Services, Inc.
- Computer security training and consulting company specializing in highly secure computer and networking systems, including Windows NT and Secure UNIX.
- Vigilar, Inc.
- Developing processes that secure and enable dynamic, distributed networks.
- Perimeter Internetworking
- Provider of Internet security, antivirus programs, and firewall protection to community financial institutions.
- Dataway, Inc.
- Specializes in managed VPNs, security policy design, firewall installation, and internet-based networking.
- ACROS Security
- Offering internal and external systems testing and auditing services.
- Sword & Shield
- Provides network security services, penetration testing, vulnerability analysis, and more.
- Principle Logic
- Offering information risk management and HIPAA compliance services including vulnerability assessments, audits, and security policy development.
- Privacy Council
- Consultants offer information and links on global privacy laws. Offer audits to help companies set up privacy policies.
- Solutionary.com
- Provides network and systems security solutions, including managed services, firewall, VPN, internal and external risk assessments, and intrusion detection.
- CygnaCom Solutions, Inc.
- Specializing in Systems Engineering and Information Technology Services. CygnaCom offers information security expertise.
- En Garde Systems
- Intrusion Response software and technical consulting in many areas of computer and network security.
- Global Privacy Solutions
- Provides information systems and middleware applications for the protection and privacy of consumer electronic data.
- e-Cop.net
- Provides regional Internet security surveillance services through round-the-clock monitoring, subscription-based intrusion detection systems, and more.
 PrivaTech Consulting
- Compliance advisors specializing in Internet privacy issues and legislation.- Canaudit
- Training company specializing in security/penetration detection for IS auditors. They also provide ISACA chapter training sessions and seminars nationwide.
- Tempest, Inc
- Preventing eavesdropping on unintentional signals produced by most electronic equipment.
- Vanguard Integrity Professionals
- We sell mainframe security software, conduct an annual security and RACF conference, and offer security training and consulting.
- NetFrameworks
- Security consulting company specializing in information and network security, network design, and information systems infrastructure.
- Information Security Engineering, Inc
- Computer and network security solutions. controlling access to the corporate resources in a open client/server environment is a challenge.
- Digital Resources Group, L.L.C.
- Assist companies in secure Online Banking and Trading efforts.
- New Dimensions International
- Provides system security services, training, risk assessment, design, and consulting.
- Anitian Corporation
- Provides network security, technical documentation, systems integration, and software engineering services to organizations nationwide.
- ABS Computer Technology
- Provides security auditing, vulnerabilities scans, and remediation as well as spam and virus filtering using Active Defence.
- SecurNet Consulting
- Internet security & computer network consulting services. we offer: security audit, Internet connectivity, secure e-mail, Windows NT, IP addressing, firewalls.
- Australian Privacy
- Resource site for PGP 5 security and encryption software.
- Key Ovation
- Manufacturer of the Goldtouch product line of ergonomic keyboards and keypads. Also provides network and enterprise security services.
- Dyad Security
- Specializes in fully integrated security outsourcing to protect critical data assets through security consulting, training, HA design, and DR planning and testing.
- Interhack Corporation
- Provides consulting and R&D for computer and Internet security, cryptography, and ecommerce. Site offers an archive of publications on cryptography, programming and more.
- Netplex Systems
- Provider of computer security, disaster recovery planning, business continuity, and business resumption planning solutions and consulting services.
- Rent-A-Hacker
- Computer security and data protection. Hire a professional hacker to protect your information assets.
- Fortrex Technologies
- Provides information security solutions including risk assessment, policy development, deployment, training, and security audits for enterprise and network systems management.
- MIS Training
- Audit and information security training. MIS courses and conferences are offered in the U.K., Europe, Middle East, and Africa, with topics such as internal and IT audits, fraud, SOX, COSO, risk management, and Sarbanes-Oxley.
- AS Stallion Ltd.
- Zeuros Network Solutions
- Consulting agency specialising in secure network systems, firewalls and secure dialup solutions
- Cadre Computer Resources
- Delivers complete network security services for your business by assessing security risks, developing security strategies, providing support, and partnering with leading security vendors.
- Identity Theft Expert
- Author and speaker Robert Siciliano provides seminars to organizations on issues of fraud, identity theft, self-defence, workplace violence, travel safety, home protection, safe daily driving, and dating without becoming a statistic.
- META Security Group
- Managed security services firm providing program management, monitoring, and incident response and safeguard management.
- Steven R. Lee Consulting
- Provides information security consulting and integration services.
- Enteredge Technology
- Offering Internet and intranet security consulting services, including, disaster recovery planning.
- Fujitsu Consulting
- Provides network, security, and business solutions to enterprises worldwide.
- ESTec Systems Corporation
- Information security consulting organization specializing in client/server and networked environments.
- VeeMost Technologies
- Expert consultants in networking and security particularly in the areas of Cisco, Novell, Microsoft, Citrix, and Linux.
- Networking Technology Solutions, Inc
- Integration and security solutions for corporate information systems.
- Valicore Technologies
- Engineering services company providing information security-related design and development services.
- Choreo Systems Inc.
- Specializing in interoperabilty, full service intranet, communications security, and voice-data integration.
- Vision Development Group, Inc. - Security Consulting
- Network security, TCP/IP protocols, web hosting and design services, and application consulting and training.
- NovaTech Internet Security
- Specialise in Security Auditing, Firewall Instillation and Configuration, secure Network Design and E-commerce.
- Netfast Communications, Inc.
- Provider of network security and information security solutions to businesses and government organizations worldwide.
- Bespoke Security Consultants
- Delivers a complete range of Internet network security solutions including traditional and managed Internet firewalls, IP VPNs, and intrusion detection systems.
- Penetration Testing Group
- Offering penetration testing.
- Stratesec
- Provides consulting, planning, engineering, systems integration, technical support, and other security technology services.
- tec-gate.com
- Provides electronic information security.
- GSR Consulting Group Inc.
- Specializing in disaster recovery planning, Internet security, and firewalls.
- AssessmentAndRepair.com
- Offers vulnerability audit, security policy development, firewall and virus protection, and monitoring services for servers, databases, and web pages.
- Information Security Systems Incorporated
- Association of engineers, mathematicians, and scientists specializing in network and computer security design and analysis.
- SecuritySciences Corporation
- Offers information security audits, performance assessments, penetration testing, business and marketing competitive intelligence, and more.
- Gambling Security
- Offers security testing for online gaming systems. Testing facilities based in Sydney, Australia, and Montreal, Canada.
- Innovative Integrators Incorporated
- Provider of network security consulting, specializing in Cisco Systems security design and implementation.
- Security.technow.com
- Offers network security training.
- Rosenthal, Philip: Computer Forensic Investigator
- Computer and Internet safety expert who assists the FBI, U.S. Secret Service, New York Attorney General, Israel National Police, and New Scotland Yard in various high-tech related cases.
- Infosecure Australia
- IT security related services offered including penetration testing, policy development and disaster recovery.
- Firewall Consultants
- Offers a variety of managed security services including vulnerability scanning, firewall monitoring, and secure co-location to help organizations continuously protect their assests from critical threats.
- Merdan Group, Inc
- Specializing in computer and communications security engineering services.
- Brivo Systems
- Specialists in access control systems for businesses to control physical access to their offices, warehouses, remote or unmanned buildings, and computer rooms.
- Keep My Network Safe
- Mike Foster helps IT professionals convince management how important IT best practices are, and helps executives understand, in plain English, what they need to know about IT security and IT best practices to protect their computers and their company.
- Media Micro Center
- Provides desktop publishing and multimedia solutions, including Mac and PC integration, desktop publishing, Mac virtualization, mail server consulting, and network security.
- Microsoft: Computer And Network Security
- Microsoft Midsize Business Security Centre offers tools for computer and network security for different industry needs.
- O-C Group - Payment Industry Specialists
- Security assessors providing solutions in payment processing technology and payment card industry audits.
- Orthus Information Security Solutions
- Services include data leakage audits, compliance gap analyses, and lifecycle services including penetration testing.
- SensePost
- Provides security services to medium to large enterprises, including technical information security assessments, consulting, and training services.
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