This paper introduces a new technique for location management in cellular networks. It avoids the recording of moving tracks of mobile subscribers. The described procedures are derived from the well known untraceable MIX network and the distributed storage of location information according to GSM networks. * We thank the Gottlieb-Daimler-and Karl-Benz Foundation, Ladenburg (Germany) and the German Science Foundation (DFG) for their financial support. For suggestions and discussions, we thank Elke Franz, Ulrich Hensel, Dogan Kesdogan, Jan Müller, Leslie & Christian "ChriRo" Rook and Ivonne Voigt. 1 The technique "broadcast over the whole served area" is not discussed in this paper! In 3rd generation mobile networks (Universal Mobile Telecommunication System, UMTS and Future Public Land Mobile Telecommunication Network, FPLMTN) the globally covered area does not allow broadcast. However, broadcasts in some parts of the globe require location management again.
We present techniques for efficient anonymous communication with real-time constraints as necessary for services like telephony, where a continuous data stream has to be transmitted. For concreteness, we present the detailed protocols for the narrow-band ISDN (Integrated Services Digital Network), although the heart of our techniques-anonymous channels-can also be applied to other networks. For ISDN, we achieve the same data rate as without anonymity, using the same subscriber lines and without any significant modifications to the long-distance network. A precise performance analysis is given. Our techniques are based on mixes, a method for anonymous communication for e-mail-like services introduced by D. Chaum.
Mobile communication offers many new opportunities. However, because of the mobility of the subscribers trustworthiness of data, reliability and security are major issues. Our objective is to increase the network's trustworthiness by providing means to prevent generation of moving tracks: The protection should be shifted into a subscriber's domain where the administration of the location information of his mobile station is handled as far as possible. Outside his domain, the subscriber should be able to act anonymously whenever possible. The location management strategies presented in this paper achieve anonymity of the communicating parties and therefore fulfill the requirement of privacy.
Abstract. Mixes allow the users of electronic data networks to communicate with each other without identifying themselves or uncovering their relationship. Several security applications suggest the usage of mixes. However, such concepts are often not commercially used in practice. One reason may be that providers are only willing to offer anonymous communication if their payment is arranged.We present an anonymity service provided by mixes and describe a payment scheme which allows its anonymous, secure payment. The scheme aims to achieve security for all: the user, the provider and the bank. Detailed protocols for the payment of mixes are described.
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