4.
What is a sequence of random binary bits that are used to encrypt and decrypt electronic signals?
A.
COMSEC custodian
B.
COMSEC key
C.
COMSEC publications
D.
COMSEC material
5.
When can a homemade code system be used?
A.
Only in emergency situations
B.
At brigade level and below
C.
At division level and higher
D.
Never
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SS0137