EKMS 5A CRYPTOGRAPHIC
EQUIPMENT
INFORMATION/GUIDANCE
MANUAL CHAPTER 3

http://navybmr.com/study%20material/EKMS%205.pdf
United States National Security Agency led
program responsible for Communications
Security (COMSEC) key management,
accounting, and distribution.
WHAT IS EKMS?
IN
CHAPTER 3 OF EKMS 5A, COMSEC
EQUIPMENTS HAS A SECTION SOLEY ON
MODIFICATION (DIFFERENT TYPES OF
MODIFICATIONS)
MODIFICATIONS

MODIFICATION
DESCRIPTION

MAJOR MODIFICATIONS

MINOR MODIFICATIONS

MANDATORY
MODIFICATIONS

OPTIONAL
MODIFICATIONS
SECTIONS
 REPAIR ACTIONS
 MODIFICATION IDENTIFICATION
 MODIFICATION IMPLEMENTATION
AUTHORIZATION
 MODIFICATION INFORMATION
RELEASE
 MODIFICATION INSTALLATION
MODIFICATION VERIFICATION
A
modification is any electrical, mechanical or
software change which may or may not
affect the electrical or mechanical
characteristics of cryptographic equipment.
 Purpose
is to install improved or special
capabilities of crypto equipment.
MODIFICATION DESCRIPTION
the
production model of a COMSEC
equipment, assembly, or applicable
software which results in a loss of
interchangeability of component parts
and/or cryptographic communicability
must be approved by NCMS and
reflected in the NSA MRC
MAJOR MODIFICATIONS
 DOESN’T
AFFECTS NEITHER CRYPTO
INTERCOMMUNICABILITY NOR PHYSICAL
INTERCHANGEABILITY
 IDENTIFIED
SLANT
BY MOD NUMBER PRECEDED BY A
 EXAMPLE
A ACC/1
MINOR MODIFICATIONS

Mandatory modifications must be installed in order to
ensure continued effectiveness of the cryptographic
equipment and to retain its approval for use.

Annex E is the primary source for mandatory
modifications.

MANDATORY MODIFICATION VERIFICATION GUIDE
(MMVG) PROVIDES DETAILED DESCRIPTION AND IS
AVAILABLE UPON REQUEST FROM NCMS.
MANDATORY MODIFICATIONS
 USUALLY
TAILORED TO A SPECIFIC
OPERATIONAL OR ENVIRONMENT NEEDS
 MAYBE
INSTALLED IN DISCRETION OF THE
COMMAND OR AS DIRECTED FROM HIGHER
AUTHORITY
OPTIONAL MODIFICATIONS
 LIKE
OPTIONAL MODS, ALSO OPTIONAL!
 DOESN’T
AFFECT ORIGINAL CHARACTERISTICS OF
CRYPTO EQUIMPMENT
 Repair
actions can include substituting supply system
parts for original design parts, increasing the wattage
rating of a resistor, and installing more rugged lamps.
 If
authorized it needs to be listed in appropriate
KAM/SAM manual.
REPAIR ACTIONS
 all
modifications are numbered sequentially for the
basic equipment only and in the order in which NSA
has approved the modification.
 listed
alphabetically by equipment short title and
MOD number.
 Example:
KY 75 MOD 1, KG 84 MOD 3, KG 38
MOD 7.
MODIFICATION IDENTIFICATION
publication
of a modification or a repair
action constitutes authorization for its
incorporation into equipment held by
Navy, Marine Corps, Coast Guard, and
Military Sealift Command units.
MODIFICATION IMPLEMENTATION
AUTHORIZATION
 is
NOT RELEASABLE to non-U.S. commands, activities,
nations or international organizations.
 All
queries and requests for information from non-U.S.
commands, activities, or persons regarding
modifications to U.S. crypto equipment held by them
must be referred to NCMS in accordance with CJSI
6510.06.
MODIFICATION INFORMATION
RELEASE
 must
be preformed at Navy Crypto Repair Facilities.
 the
EKMS Manager must issue MOD kits on local
custody to qualified COMSEC maintenance personnel
within the prescribe time compliance date.
 Qualified
COMSEC maintenance personnel must
promptly report the installation and destruction of
MOD kit residue to the EKMS Manager.
MODIFICATION INSTALLATION
 EKMS
Managers ensures the mandatory
modifications and optional mission required
modifications have been installed.
 Modification
verification will be accomplished
during each scheduled inspection and during
CMS Advise and Assistance Team visits in
accordance with EKMS 3.
MODIFICATION VERIFICATION

EKMS 3C – EKMS INSPECTION MANUAL

KAM - Key Account Management

SAM - Strategic Account Management

NCMS - Naval Communications Material System

NSA - Naval Support Activity

SF-153; DESTRUCTION REPORT
*TIME COMPLIANCE DATE* final section of modification; are issued with
each mandatory modification. And if unusual circumstance exist, an
interim exception to mandatory dates must be requested and reported to
NCMS, DIRNSA, And chain of command.
ADDITIONAL INFO