Abstract.It is sometimes required t h a t user pairs in a network share secret information t o be used for mutual identification or as a key in a cipher system. If the network is large i t becomes impractical or even impossible to store all keys securely at the users. A natural solution then is to supply each user with a relatively small amount of secret data from which he can derive all his keys. A scheme for this purpose will be presented and we call such a scheme a symmetric key generation system (SKGS). However, as all keys will be generated from a small amount of data, dependencies between keys will exist. Therefore by cooperation, users in the system might b e able t o decrease their uncertainty about keys they should not have access to.The objective of this paper is to present a class o f SKGS for which the amount of secret information needed by e a c h user to generate his keys is the least possible while a t t h e s a m e time a certain minimum number of users have to cooperate to resolve the uncertainty of unknown keys.
We propose a concept for public safety communication realized with IMS (IP Multimedia Subsystem), the cellular standards of 3GPP and packet switched transmission. Basing the solution on mainstream cellular technology leverages the economy of scale of today's commercial networks and enables migration of technical solutions and applications.Important requirements of the Public Safety sector are group communication, low latency, high capacity, security, reliability and interoperability for voice and broadband data services. Our analysis shows that the concept has the technology potential to meet these public safety requirements.
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