Searching for authors named "George Savvides" – sorted by Relevance.
8 documents found, showing 1 through 8.
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Interactive Hashing and reductions between Oblivious Transfer variants
- …Interactive Hashing has featured as an essential ingredient in protocols realizing a large variety of cryptographic tasks. We present a study of this important cryptographic tool in the information theoretic context. We start by presenting a security definition which is independent of any particular…
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Access Control Lists for the Self-Certifying Filesystem
- …The Self-certifying File System (SFS) currently exports Unix filesystems. Consequently, file owners on SFS servers who want to give other users access to their files can do so only through the coarse-grained Unix access control mechanisms, which are based on locally de ned user identifiers and group…
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Optimal reductions between oblivious transfers using interactive hashing
- …Abstract. We present an asymptotically optimal reduction of one-outof-two String Oblivious Transfer to one-out-of-two Bit Oblivious Transfer using Interactive Hashing in conjunction with Privacy Amplification. Interactive Hashing is used as in an innovative way to test the receiver’s adherence to th…
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Information-Theoretic Conditions for Two-Party Secure Function Evaluation
- …Abstract. The standard security definition of unconditional secure function evaluation, which is based on the ideal/real model paradigm, has the disadvantage of being overly complicated to work with in practice. On the other hand, simpler ad-hoc definitions tailored to special scenarios have often b…
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Decentralized user authentication in a global file system
- …ABSTRACT The challenge for user authentication in a global file system is al-lowing people to grant access to specific users and groups in remote administrative domains, without assuming any kind of pre-existingadministrative relationship. The traditional approach to user authentication across admin…
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Decentralized User Authentication in a Global File System
- …The challenge for user authentication in a global file system is allowing people to grant access to specific users and groups in remote administrative domains, without assuming any kind of pre-existing administrative relationship. The traditional approach to user authentication across administrative…
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Information-Theoretic Conditions for
- …The standard security definition of unconditional secure function evaluation, which is based on the ideal/real model paradigm, has the disadvantage of being overly complicated to work with in practice.…
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1 Topics Covered
- …Introduction. Review of Complexity: Reductions, Time, Space, Nondeterminism. Lecture 02 (2/11): Relativization. Baker-Gill-Solovay. Introduction to Alternation. Lecture 03 (2/13): Alternation. ATIME vs. SPACE, ASPACE vs. TIME. Lecture 04 (2/19): Power of Alternation: Fortnow's Time/Space lower …
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