Lothar Fritsch

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Secure processing of location data in location-based services (LBS) can be implemented with cryptographic protocols. We propose a protocol based on oblivious transfer and homomorphic encryption. Its properties are the avoidance of personal information on the services side, and a fair revenue distribution scheme. We discuss this in contrast to other LBS(More)
Identity management system(s) (IDMS) do rely on tokens in order to function. Tokens can contribute to privacy or security risk in IDMS. Specifically, the characteristics of tokens contribute greatly to security and privacy risks in IDMS. Our understanding of how the characteristics of token contribute to privacy and security risks will help us manage the(More)
Location Based Services (LBS) werden große Umsatzpotentiale für mobile Datendienste zugeschrieben, da durch sie personalisierte, ortsabhängige Dienste für Nutzer maßgeschneidert angeboten werden können. Doch trotz vorhandener Geschäftsmodelle und weiter Verbreitung der Mobilfunkinfrastrukturen ist das Dienstangebot überschaubar, die Umsätze ebenso. Zur(More)
Four years have passed since the EU directive on electronic signatures has been enacted by the European Union. By 2002, all EU member countries had to implement local legislation for electronic signatures. Development of products and applications in these countries so far, mainly focuses on signing with desktop PC’s on the basis of smart cards, issued by(More)
The spread of mobile communication equipment offers new opportunities for disaster management referring to civilians. At the same time, location based services are regarded as privacy invading, and are regulated in many countries by specific legislation. We analyze the requirements of a LBS-based disaster management scenario that enables the timely(More)