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TIA-102.AACA

Project 25 Digital Radio Over-the-Air Rekeying (OTAR) Protocol

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Organization: TIA
Publication Date: 12 April 2001
Status: inactive
Page Count: 182
scope:

The Project 25 standard covers all of the parts of a system for public safety land mobile radio communications. These systems include subscriber units, base stations and other fixed equipment. The subscriber units include portable radios for handheld operation and mobile radios for vehicular operation. The base stations are used for geographically fixed installations. Other fixed equipment is used for wide area operation and console operator positions. Computer equipment may be used to interface between each of these equipment items. A Common Air Interface (CAI) (Reference 2) allows these radios to send and receive digital information over a radio channel.

Many of the parts of a public safety land mobile radio communications system will use encryption to protect the information which is sent through the system. The encryption algorithms require keys in order to protect the confidentiality of this information. The process by which these encryption keys are generated, stored, protected, transferred, loaded, used and destroyed is known as key management. These keys must be protected from inadvertent disclosure and require updating or replacement in order to maintain system security. Key distribution is often accomplished manually. However, the most convenient way to distribute keys is to electronically send the keys from a key management facility to the destination equipment. This involves sending keys over the CAI and this procedure is referred to as Over-the Air-Rekeying (OTAR). OTAR is a method of encrypting and sending the encryption keys and other related key management messages through the CAI in such a way that they are protected from inadvertent disclosure and, in some cases, unauthorized modification.

 

Document History

September 1, 2021
Project 25 Digital Radio Over-The-Air-Rekeying (OTAR) Messages and Procedures
The TIA-102 suite of documents describes the interfaces associated with a system for public safety land mobile radio communications. These systems include subscriber units, base stations and other...
November 6, 2020
Project 25 Digital Radio Over-The-Air-Rekeying (OTAR) Messages and Procedures- Addendum 1
Addendum Scope This addendum provides the following enhancements to the OTAR Messages and Procedures (TIA-102.AACA-A) standard: 1. Clarify the use of the Key ID field for single-key and multi-key...
September 10, 2014
Project 25 Digital Radio Over-The-Air-Rekeying (OTAR) Messages and Procedures
The TIA-102 suite of documents describes the interfaces associated with a system for public safety land mobile radio communications. These systems include subscriber units, base stations and other...
March 13, 2003
Project 25 Digital Radio Over-the-Air Rekeying (OTAR) Protocol Addendum 2 – Data Link Independent OTAR
This addendum specifies a method to transport Over The Air Rekeying (OTAR) Key Management Messages (KMMs) between a Key Management Facility (KMF) and an Mobile Radio (MR) that is independent of the...
November 27, 2002
Project 25 Digital Radio Over-the-Air-Rekeying (OTAR) Protocol Addendum 1 – Key Management Security Requirements for Type 3 Block Encryption Algorithms
Introduction This addendum specifies the general security requirements to be used when transmitting Type 3 Key Management Messages (KMMs) as defined in the Over The Air Rekeying (OTAR) Protocol...
TIA-102.AACA
April 12, 2001
Project 25 Digital Radio Over-the-Air Rekeying (OTAR) Protocol
The Project 25 standard covers all of the parts of a system for public safety land mobile radio communications. These systems include subscriber units, base stations and other fixed equipment. The...
December 1, 2000
Project 25 over-the-Rekeying (OTAR) Protocol Addendum
A description is not available for this item.
January 1, 1996
APCO Project 25 Over-The-Air-Rekeying (OTAR) Protocol New Technology Standards Project Digital Radio Technical Standards
A description is not available for this item.

References

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