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Electronic Colloquium on Computational Complexity

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TR05-009 | 14th December 2004
David P. Woodruff, Sergey Yekhanin

A Geometric Approach to Information-Theoretic Private Information Retrieval

A t-private private information retrieval (PIR) scheme allows a user to retrieve the i-th bit of an n-bit string x replicated among k servers, while any coalition of up to t servers learns no information about i. We present a new geometric approach to PIR, and obtain (1) A t-private ... more >>>


TR05-008 | 11th December 2004
Neeraj Kayal

Recognizing permutation functions in polynomial time.

Let $\mathbb{F}_q$ be a finite field and $f(x) \in \mathbb{F}_q(x)$ be a rational function over $\mathbb{F}_q$.
The decision problem {\bf PermFunction} consists of deciding whether $f(x)$ induces a permutation on
the elements of $\mathbb{F}_q$. That is, we want to decide whether the corresponding map
$f : \mathbb{F}_q ... more >>>


TR05-007 | 15th December 2004
Vadim Lyubashevsky

On Random High Density Subset Sums

In the Subset Sum problem, we are given n integers a_1,...,a_n
and a target number t, and are asked to find the subset of the
a_i's such that the sum is t. A version of the subset sum
problem is the Random Modular Subset Sum problem. In this version,
the ... more >>>



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