## Cryptology ePrint Archive: Report 2017/177

Some results on the existence of $t$-all-or-nothing transforms over arbitrary alphabets

Navid Nasr Esfahani, Ian Goldberg and D. R. Stinson

Abstract: A $(t, s, v)$-all-or-nothing transform is a bijective mapping defined on $s$-tuples over an alphabet of size $v$, which satisfies the condition that the values of any $t$ input co-ordinates are completely undetermined, given only the values of any $s-t$ output co-ordinates. The main question we address in this paper is: for which choices of parameters does a $(t, s, v)$-all-or-nothing transform (AONT) exist? More specifically, if we fix $t$ and $v$, we want to determine the maximum integer $s$ such that a $(t, s, v)$-AONT exists. We mainly concentrate on the case $t=2$ for arbitrary values of $v$, where we obtain various necessary as well as sufficient conditions for existence of these objects. We consider both linear and general (linear or nonlinear) AONT. We also show some connections between AONT, orthogonal arrays and resilient functions.

Category / Keywords: foundations / combinatorial cryptography

Date: received 21 Feb 2017

Contact author: dstinson at uwaterloo ca

Available format(s): PDF | BibTeX Citation

Short URL: ia.cr/2017/177

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