LESSON 3
PRACTICE EXERCISE
ANSWER KEY AND FEEDBACK
Item
Correct Answer and Feedback
1.
B.
The sequence of randomly-generated binary bits used for encrypting or decrypting signals
The term key means the sequence of randomly-generated binary bits used for encrypting or
decrypting signals (page 3-2, para 2a).
2.
C.
Traffic encryption, key encryption, transmission security, and key production
The four major types of COMSEC keys are traffic encryption, key encryption, transmission
security, and key production (page 3-2, para 2a(1-4)).
3.
A.
A protective marking for information for official use only (not for public disclosure)
FOR OFFICIAL USE ONLY (FOUO) is a protective marking for information for official use
only (not for public disclosure)(page 3-4, para 5b).
4.
D.
TB 380-41 series
The TB 380-41 series is the primary reference a COMSEC custodian should have (page 3-5,
para 6d).
5.
D.
COMSEC Material Management Data Catalog
ARKAG 2 refers to the COMSEC Material Management Data Catalog (page 3-3, para 4).
6.
B.
Controlled item inventory code
CIIC refers the controlled item inventory code (page 3-3, para 4b).
7.
A.
TB 380-41 series
The TB 380-41 series is the primary reference for COMSEC information about accounting
and reporting procedures (page 3-5, para 6d).
SS0137
3-8
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