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 recur-sively 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(More)
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