Luzius Meisser

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We present Cryptree, a cryptographic tree structure which facilitates access control in file systems operating on untrusted storage. Cryptree leverages the file system's folder hierarchy to achieve efficient and intuitive, yet simple, access control. The highlights are its ability to recursively grant access to a folder and all its subfolders in constant(More)
Peer-to-peer (p2p) systems have the potential to harness huge amounts of resources. Unfortunately, however, it has been shown that most of today’s p2p networks suffer from a large fraction of free-riders, who consume resources without contributing much to the system themselves. This results in an overall performance degradation, and hence proper incentives(More)
In this thesis, we discuss the implementation of a reputation system called Havelaar. The aim of Havelaar is to provide incentives for contributing in a peer-to-peer network, namely the new peer-to-peer overlay network Kangoo, which is currently being developed at ETH Zürich. First some general properties and problems of designing such a reputation system(More)
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