1、 TIA STANDARD ANSI/TIA-102.AACA-2-2003 Approved: March 13, 2003 Project 25 Digital Radio Over-the-Air Rekeying (OTAR) Protocol Addendum 2 Data Link Independent OTAR TIA-102.AACA-2 (Addendum No. 2 to TIA/EIA-102.AACA) MARCH 2003 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunicati
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24、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-102.AACA - 2 1 ADDENDUM 2 DATA LINK INDEPENDENT OTAR 1 Scope This addendum specifies a method to transport Over The Air Rekeying (OTAR) Key Management Messages (KMMs) between a Key Management Facility (KMF) and an Mo
25、bile Radio (MR) that is independent of the physical and data transport layers. It defines optional key management procedures for Registration and Deregistration of the MR with the KMF. An Unable-To-Decrypt message has also been defined to respond to a message that was received and could not be decry
26、pted. The addendum supplements the information contained in the TIA/EIA 102.AACA APCO Project 25 Over-The-Air-Rekeying (OTAR) Protocol document (reference 1) and in TIA/EIA 102.AACA-1 Key Management Security Requirements For Type 3 Block Encryption Algorithms (reference 2). To allow for data link in
27、dependent transport of KMMs, the encryption synchronization (ESYNC) has been appended to the beginning of the KMM and is included as part of the data packet. The method defined in the addendum may be used with any KMM that is defined in the OTAR Protocol standard (reference 1). 2 Revision History Ve
28、rsion 1.0, August 2, 2002, first draft. Version 1.1, September 30, 2002, second draft. SP-3-4824-AD2, Version 1.2, October 30, 2002, ballot version. TIA/EIA 102.AACA-2, February 14, 2003, modified for editorial comments from ballot resolution. 3 References The following standards contain provisions
29、which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most rec
30、ent editions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. 1. TIA/EIA 102.AACA, Project 25 Digital Radio Over The Air Rekeying (OTAR) Protocol, April 2001 Copyright Telecommunications Industry Association Provided by IHS un
31、der license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-102.AACA - 2 2 2. TIA/EIA 102.AACA-1, Addendum 1 - Key Management Security Requirements for Type 3 Block Encryption Algorithms, November 2002 3. TIA/EIA 102.AACB, Over-The-Air-Rekeying (OTAR) O
32、perational Description, November 2002 4. TIA/EIA-102.BAAC, Project 25 Common Air Interface Reserved Values, May 2000 5. TIA/EIA 102.BAEB-1, Project 25 Packet Data Specification - Addendum 1 - Subnetwork Dependent Convergence Protocol (SNDCP), October 2001 6. IETF RFC 791, Internet Protocol, Septembe
33、r 1981 7. IETF RFC 768, User Datagram Protocol, August 1980 4 Abbreviations ALGID Algorithm ID CAI Common Air Interface CS CheckSum ESYNC Encryption Synchronization IETF Internet Engineering Task Force ID Identification IP Internet Protocol KEK Key Encryption Key KEYID Key Identification KMF Key Man
34、agement Facility KM Key Management KMM Key Management Message LSB Least Significant Bit MAC Message Authentication Code MFID Manufacturer ID MI Message Indicator MN Message Number MNL Last Message Number MNP Message Number Period MNR Message Number Received MR Mobile Radio MSB Most Significant Bit O
35、TAR Over-The-Air Rekeying RSI Radio Set Identifier SAP Service Access Point SNDCP SubNetwork Dependent Convergence Protocol TEK Traffic Encryption Key UDP User Data Protocol Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or netwo
36、rking permitted without license from IHS-,-,-TIA-102.AACA - 2 3 5 OTAR Overview Data Link independent KMM datagrams are defined as an associated KMM Preamble and KMM carried in a single data message. Data messages may be as defined in Figure 6.5 of reference 1. The format of the Data Link Independen
37、t KMM Datagram is: Figure 5.1 Data Link Independent KMM Datagram This message structure can be passed to any Data Link layer as a datagram for transport. It is not pertinent as to what transport layer is used. The KMM Preamble is used to specify encryption of the KMM. The KMM Preamble is as defined
38、in detail in this addendum. KMM Preamble is always included in all KMM datagrams. The KMM may be as defined in TIA/EIA-102.AACA (reference 1) or in this addendum. 5.1 KMM Preamble In order to better support a Data Link layer independent based structure, encryption of the KMM shall occur at the appli
39、cation layer. The physical layer or data link layer may additionally encrypt the OTAR payload but it would not be necessary for OTAR operation. The KMM Preamble shall consist of an KMM Preamble Format octet and a block of octets (KMM Preamble Message Body) as defined by the version number. The KMM P
40、reamble Format octet shall contain 3 reserved bits and a 5-bit version field. KMM datagram KMM KMM Preamble Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-102.AACA - 2 4 Ta
41、ble 5.1.1 KMM Preamble Structure Octet 0 Reserved Version KMM Preamble Format 1 Preamble Message Body Length of Message Body 7 6 5 4 3 2 1 0 KMM Preamble Format This octet contains 3 reserved bits and a version number that selects which definition of the Preamble Message Body is to be used. Reserved
42、 - These 3 bits are reserved for future use and shall be set to 0. Version - These 5 bits define which version of the KMM Preamble Message Body is used. Preamble Message Body This block shall be uniquely defined for each version number. The Preamble Message Body shall be defined in the following sec
43、tions for valid version numbers. 5.1.1 Preamble Message Body - Version 0 The Preamble Message Body shall contain the Manufacturer Identifier, Algorithm Identifier, Key Identifier and the Message Indicator as Shown in Table 5.1.2 when the version number is set to 0 in the KMM Preamble Format octet. T
44、able 5.1.2 Preamble Message Body Format Version 0 Octet 0 MFID 1 Algorithm ID 2 Key ID 3 4 Message Indicator 9 octets 12 7 6 5 4 3 2 1 0 MFID - The MFID is used to indicate whether the Algorithm ID is a standard value or if it is defined by the Manufacturer identified by the MFID or if any portion o
45、f the KMM Preamble and/or KMM is proprietary to the Manufacturer identified by the MFID. The format for this field is defined in reference 4. Algorithm ID - The Algorithm ID is used to indicate the Algorithm used to encrypt the KMM. The format for this field is defined in the Primitive Field Definit
46、ions section for Algorithm ID, reference 1. Key ID - The Key ID indicates the TEK used to encrypt the KMM. The format for this field is defined in the Primitive Field Definition section for Key ID, reference 1. Message Indicator - Provides the Message Indicator (encryption synchronization) for the e
47、ncryption algorithm when the message is sent encrypted. This field will contain all zeros if the Algorithm ID is set to $80 and the Key ID is set to $0000 (indicating a clear message). The format for this field is defined in the Primitive Field Definition section for Message Indicator, reference 1.
48、Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-102.AACA - 2 5 5.2 KMM The KMM consists of a KMM Header and KMM Body. 5.2.1 KMM Header The KMM Header format will be as defin
49、ed in the Message Definitions section of reference 1. 5.2.2 KMM Body The KMM Body format will be as defined in the Message Definitions section of reference 1 and in this addendum. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-102.AACA - 2 6 6 Data Link Indep
