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Generally speaking, a stand-alone computer system can qualify for Trusted Computer certification if it meets the objectives in DoD document 5200.28-STD and passes the DoD’s evaluation process. Several vendors put their operating systems through this process. Although Microsoft makes the operating systems for the majority of desktop computers, only its Windows NT product has been submitted and approved for the Trusted Computer certification.


For the exam, you must know that Windows NT Server is C2-level certified for Trusted Computer (Orange Book). If the computer on which Windows NT Server is installed is connected to a network, however, it loses the C2 Trusted Computer certification.

Trusted Network Interpretation


In 1987, the NCSC released enhanced testing criteria based on the Orange Book standard. The new standard, NCSC-TG-005, is called the Red Book and is the Trusted Network Interpretation Environmental Guideline (TNIEG). Trusted computers are addressed in the Orange Book. The Red Book defines the certification criteria for trusted networks. They both use the D through A levels. As with the C2 class in the Trusted Computer implementation, the C2 class is the highest class for generic network operating systems. Higher-level classes require that operating systems be specifically written to incorporate security-level information as the data is input.


With a C2 Trusted Network certification, network operating systems must provide a unique user account for each person on the network and provide accountability for the information the user uses. Additionally, the network communications must be secure.


Currently, several network operating systems are under evaluation for C2 Trusted Network certification. However, the only currently available network operating system that has achieved C2 Trusted Network certification is NetWare 4.1.

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