Security

Efficient Multi-Dimensional Key Management in Broadcast Services

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Executive Summary

The ubiquity of digital communication today allows it to be easily used for a variety of broadcast or streaming services. For instance, Location-Based Services (LBS) have become widely spread and deployed; examples of such services include LOC-AID and Garmin. In these systems, a user typically can subscribe to a geo-spatial area for a specified duration of time and is able to query the system for spatial-temporal information such as traffic conditions, points of interest near a particular geographic location, or receive periodic updates such as the weather forecast. There is obviously a need to ensure that only legitimate subscribers can obtain access to the information within their subscription rights.

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