Which minimum TCSEC security class category specifies trusted
distribution controls?
A.
B2
B.
B3
C.
C2
D.
A1
Explanation:
Trusted distribution is defined by the Orange Book as a requirement
of A1 TCB assurancE. Trusted distribution includes procedures to
ensure that all of the TCB configuration items, such as the TCB software,
firmware, hardware, and updates, distributed to a customer site
arrive exactly as intended by the vendor without any alterations.
Any alteration to the TCB at any time during the system life cycle
could result in a violation of the system security policy. Assurance
that the system security policy is correctly implemented and operational
throughout the system life cycle is provided by different
TCSEC requirements. At TCSEC class Al, trusted distribution, in conjunction
with configuration management, provides assurance that
the TCB software, firmware, and hardware, both original and
updates, are received by a customer site exactly as specified by the
vendors master copy. Trusted distribution also ensures that TCB
copies sent from other than legitimate parties are detecteD. Source:
NCSC-TG-008 A Guide to Understanding Trusted Distribution in
Trusted Systems [Lavender Book].