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FM 11-23
6-6. Electronic Warfare follows. (Refer to FM 32-5 for a more detailed
discussion.)
All actual or suspected jamming and imitative discussion
communications activities by the enemy will be
reported to the net control station (NCS). To reduce
a. Cryptosecurity.
the effects of jamming, special attention is (1) Use only authorized cryptosystems.
required to the provisions for alternative means (2) Insure strict compliance with the operof
communication. General guidance for employ- ating instructions.
ment of electronic counter-countermeasures in
unit radio operations is provided in FM 32-20. (3) Use cryptosystems designed to provide
the degree and term of security required.
6-6. Communications Security b. Physical Security.
Communications security is defined as the protec- (1) Maintain proper safeguards against caption
resulting from all measures designed to deny ture theft or unauthorized observation of mesto
unauthorized persons information of value sages and COMSEC materials at all times.
which might be derived from the possession and
study of telecommunications, or to mislead unau- (2) Maintain adequate emergency evacuation
thorized persons in their interpretations of the and destruction plans and practice them freresults
of such a study. Communications security quently.
includes cryptosecurity, physical security, and (3) Guard against carelessnes and laxity by
transmission security.
frequent inspections and tests of security measa.
Cryptosecurity is that component of com- ures.
munications security which results from the
provision of technically sound cryptosystems and
c. Transmission Security.
their proper use.
(1) Use radio transmission only when other
means of communications are not adequate.
b. Physical security, as included here, is that
part of communications security concerned with (2) Be aware that all means of transmission,
physical measures designed to prevent unautho- not only radio, are subject to interception by unaurized
access to equipment, facilities, material, and thorized personnel. Restrict unclassified plain landocuments.
Refer to AR 380-5 and AR 380-40 for guage transmission to a minimum.
detailed information.
(3) Maintain circuit discipline and avoid exc.
Transmission security is that component of traneous transmissions.
communications security which results from all (4) Assign call signs/words and frequencies
measures designed to protect transmissions from in a random manner and change them simultaunauthorized
interception, traffic analysis, and neously at frequent intervals.
imitative deception.
(5) Make transmissions brief.
6-7. Application of Communications
(6) Use broadcast and intercept transmission
methods when possible.
Security
(7) Use only prescribed communications op-
The basic objective of COMSEC is to prevent un- eration procedures.
authorized personnel from gaining useful information
from communications. This objective can (8) Use authentication properly.
only be realized if all personnel are security con- (9) Use minimum power required.
scious and are aware of their personal responsibilities
in this regard. COMSEC should be a habit 6-8. Communications Security Assistance
. . a state of mind developed through training
and application in daily routine. All personnel COMSEC assistance for facilities used by signal
should be thoroughly familiar with and follow units may be provided, as appropriate, by tactical
the security practices designed to minimize the support elements of the U.S. Army Security
value of communications as a source of intellig- Agency (USASA) group of a field army or by
ence to unauthorized personnel. A summary of USASA (theater) headquarters, in accordance
the more basic practices for effective COMSEC with AR 10-122.
6-2