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Remote Area OTAR Service with a KVL and Radio Disclosure Number: IPCOM000004805D
Original Publication Date: 2001-Jun-05
Included in the Prior Art Database: 2001-Jun-05
Document File: 1 page(s) / 27K

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Chris A. Kruegel: AUTHOR


Remote Area OTAR Service with a KVL and Radio

This text was extracted from a WORD97 document.
This is the abbreviated version, containing approximately 100% of the total text.

Key management in a two-way radio system can be a challenging task, especially in large systems. Over the Air Rekeying (OTAR) is an effective method of maintaining and updating encryption keys in a two-way radio system. A Key Variable Loader (KVL) can also be used to perform key management. The KVL can act as a supplement to the OTAR service or as the main key management tool if OTAR is not available.

In areas with no OTAR service available, key management of subscribers can be difficult and time consuming. Each subscriber that requires service must be located and physically attached to a KVL to perform the necessary key management functions.

To make this process easier, a subscriber and a KVL can be used to broadcast the desired key management messages (KMMs) on the working channel(s) in these areas. See Figure 1 for the system configuration.

To start the process, the KVL operator would connect a KVL to the system's key management facility (KMF) to load the KMMs for either a group of subscribers or an individual subscriber into the KVL. Then the KVL would be attached to a subscriber in the designated area. At this point the KVL and subscriber would be put into a special key management mode. In this mode the KVL would send the KMMs to the subscriber. The subscriber would then send the KMMs over the air on the working channel selected in the subscriber. Other subscribers on that working channel would receive the KMMs over the air and act on them accordingly. The KVL-subscriber combination ("Portable KMF") could also capture any over the air acknowledgements

to the KMMs and forward this information back to the KMF at a later time.

For example, if a search and rescue team is to be deployed in an area with no OTAR coverage, this solution will make key management of subscribers in this area easier and more efficient. Each individual subscriber will not have to be physically connected to a KVL allowing groups of subscribers to be updated quickly. This solution effectively extends a system's OTAR coverage area.

Figure 1: OTAR Service with a KVL and Radio