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Linear hash families and forbidden configurations

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Abstract

The classical orthogonal arrays over the finite field underlie a powerful construction of perfect hash families. By forbidding certain sets of configurations from arising in these orthogonal arrays, this construction yields previously unknown perfect, separating, and distributing hash families. When the strength s of the orthogonal array, the strength t of the hash family, and the number of its rows are all specified, the forbidden sets of configurations can be determined explicitly. Each forbidden set leads to a set of equations that must simultaneously hold. Hence computational techniques can be used to determine sufficient conditions for a perfect, separating, and distributing hash family to exist. In this paper the forbidden configurations, resulting equations, and existence results are determined when (s, t) ∈ {(2, 5), (2, 6), (3, 4), (4, 3)}. Applications to the existence of covering arrays of strength at most six are presented.

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Correspondence to Charles J. Colbourn.

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Communicated by P. Wild.

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Colbourn, C.J., Ling, A.C.H. Linear hash families and forbidden configurations. Des. Codes Cryptogr. 52, 25–55 (2009). https://doi.org/10.1007/s10623-008-9266-7

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  • DOI: https://doi.org/10.1007/s10623-008-9266-7

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