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- W2488454996 abstract "This thesis presents a set of efficient and practical tools that can be used to enhance security of existing distributed systems. Our tools achieve marked improvements in bit, round, and communication complexity compared to generic multi-party solutions. We begin by introducing a new cryptographic primitive, called the blind coupon mechanism (BCM). The BCM is effectively an AND-homomorphic bit commitment scheme. It provides a missing link in protocol design because it was not known how to construct such commitments before. Next, we give a simple construction of a verifiable random function (VRF). A VRF is a pseudo-random function that provides publically verifiable proofs of its outputs' correctness. Our VRF is quite practical compared to prior constructions. It has already been used to construct a compact e-cash scheme [CHL05] and a distributed electronic lottery [CHYC05]. We then use our VRF to construct an O(1) round distributed protocol for the Luby-Rackoff construction, yielding the first reasonably efficient threshold pseudo-random permutation (PRP). Many protocols that use PRPs like a CBC block cipher mode can now be translated into the distributed setting. Finally, we consider incentive compatibility in the context of distributed systems. We propose a simple game for modeling containment of the spread of viruses in a network of users, and show that allowing selfish users decide whether or not to install a security technology can be highly undesirable." @default.
- W2488454996 created "2016-08-23" @default.
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- W2488454996 date "2006-01-01" @default.
- W2488454996 modified "2023-09-23" @default.
- W2488454996 title "Efficient cryptographic tools for secure distributed computing" @default.
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