Matthias Fischmann

Learn More
Database outsourcing, whilst becoming more popular in recent years, is creating substantial security and privacy risks. In this paper, we assess cryptographic solutions to the problem that some client party (Alex) wants to outsource database operations on sensitive data sets to a service provider (Eve) without having to trust her. Contracts are an option,(More)
RFID tags are held to become ubiquitous in logistics in the near future , and item-level tagging will pave the way for Ubiquitous Computing, for example in application fields like smart homes. Our paper addresses the value and the production cost of information that can be gathered by observing these tags over time and different locations. We argue that(More)
Database outsourcing has become popular in recent years, although it introduces substantial security and privacy risks. In many applications, users may not want to reveal their data even to a generally trusted database service provider. Several researchers have proposed encryption schemes, such as privacy homomorphisms, that allow service providers to(More)
To my family, which always believed in me. Abstract Conformal powers of the Dirac operator on semi Riemannian spin manifolds are investigated. We give a new proof of the existence of conformal odd powers of the Dirac operator on semi Riemannian spin manifolds using the tractor machinery. We will also present a new family of conformally covariant linear(More)
  • 1