M00002537
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TIA-102.AACC Revision A, August 8, 2006 Project 25 - Conformance Tests for Project 25 Over-The-Air Rekeying (OTAR) Protocol
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Availability date: 09/09/2021
Description / Abstract:
This document provides a series of conformance tests for the
Project 25 Over-The- Air-Rekeying (OTAR) Protocol, reference 1.
These tests are intended to assure that the equipment conforms to
the message formats specified in the OTAR Protocol document. This
is a first step (necessary but not sufficient) for interoperability
with other equipment conforming to the standard. These tests
provide for the encryption of keys and the generation of the
Message Authentication Code (MAC) that may be part of a Key
Management Message (KMM). The tests generating KMM data messages,
that may contain encrypted keys and/or a MAC, will not perform the
outer layer encryption (the encryption of the data message with a
traffic key). The output of these tests will generate a file
containing plain text data message(s) suitable to be encrypted by
the programs provided in the Conformance Test for the Project 25
DES Encryption Protocol, reference 2.
The reader is advised that OTAR uses Project 25 data messages.
As a result, it may be part of a larger data service and relevant
TIA/EIA Data documents should be consulted for any necessary
protocols such as data registration and data affiliation.
These conformance tests are intended to verify that KMMs
produced by equipment are correctly generated, that keys contained
within these KMMs are properly encrypted, and that the Message
Authentication Code (MAC) is correctly computed, all in accordance
with the Project 25 Over-The-Air-Rekeying (OTAR) Protocol. The
tests also verify that the equipment receiving KMMs properly parses
the KMMs, any encrypted keys received are correctly decrypted, and
MACs are correctly computed at the receiver. The OTAR conformance
tests do not verify compliance to the DES Encryption Protocol,
reference 3, or to the Recommended Common Air Interface (CAI),
reference 4.
The encryption of keys and the generation of the MAC per this
conformance test are not intended to verify compliance with the DES
standard, given in references 5 and 6. Tests for compliance to the
DES standard exist, such as in reference 7. These tests should be
done as a prerequisite to the conformance tests described in this
document.
These tests are to be applied by a manufacturer of a product
implementation to verify that it conforms to the Project 25
Over-The-Air-Rekeying (OTAR) Protocol. These tests apply to radio
products, particularly portable and mobile radios and fixed
equipment that includes key management functions. Some of the tests
are designed to apply to equipment generating the KMMs, while other
tests are designed to apply to the receiver of the KMMs.
These tests are different and distinct from performance tests,
given in references 8 and 9, that measure the actual limits of
equipment performance. The performance and conformance tests are
mutually complementary. These tests are also different and distinct
from lock down tests, which are intended to demonstrate
interoperability between different radios. These conformance tests
are intended to precede lock down tests.