Derandomized Constructions of k-Wise (Almost) Independent Permutations

Constructions of k-wise almost independent permutations have been receiving a growing amount of attention in recent years. However, unlike the case of k-wise independent functions, the size of previously constructed families of such permutations is far from optimal. This paper gives a new method for reducing the size of families given by previous constructions. Our method relies on pseudorandom generators for space-bounded computations. In fact, all we need is a generator, that produces “pseudorandom walks” on undirected graphs with a consistent labelling. One such generator is implied by Reingold’s log-space algorithm for undirected connectivity [35, 36]. We obtain families of k-wise almost independent permutations, with an optimal description length, up to a constant factor. More precisely, if the distance from uniform for any k tuple should be at most δ, then the size of the description of a permutation in the family is O(kn + log 1 δ ).

• Type: Conference
• Year: 2005
• Where: APPROX
• Authors: Eyal Kaplan, Moni Naor, Omer Reingold
• Keywords: Algorithms, APPROX 2005, Independent Permutations, K-wise Independent Functions, Reingold’s Log-space Algorithm