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Random Structures and Algorithms
Paper

Simple Constructions of Almost k‐wise Independent Random Variables

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Abstract

We present three alternative simple constructions of small probability spaces on n bits for which any k bits are almost independent. The number of bits used to specify a point in the sample space is (2 + o(1)) (log log n + k/2 + log k + log 1/ϵ), where ϵ is the statistical difference between the distribution induced on any k bit locations and the uniform distribution. This is asymptotically comparable to the construction recently presented by Naor and Naor (our size bound is better as long as ϵ < 1/(k log n)). An additional advantage of our constructions is their simplicity. Copyright © 1992 Wiley Periodicals, Inc., A Wiley Company

Date

11 Oct 2006

Publication

Random Structures and Algorithms

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