Simple Constructions of Almost k‐wise Independent Random Variables

Abstract
We present three alternative simple constructions of small probability spaces onnbits for which anykbits are almost independent. The number of bits used to specify a point in the sample space is (2 +o(1)) (log logn+k/2 + logk+ log 1/ϵ), where ϵ is the statistical difference between the distribution induced on anykbit 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/(klogn)). An additional advantage of our constructions is their simplicity.

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