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Title:
The Security of Chaffing and Winnowing
Authors: Mihir Bellare, Alexandra Boldyreva
Abstract:This paper takes a closer look at Rivest’s
chaffing-and-winnowing paradigm for data privacy. We begin with a
\textit{definition} which enables one to determine clearly whether a
given scheme qualifies as ``chaffing-and-winnowing.‘’ We then analyze
Rivest’s schemes to see what quality of data privacy they provide. His
simplest scheme is easily proven secure but is ineffient. The security
of his more efficient scheme —based on all-or-nothing transforms
(AONTs)— is however more problematic. It can be attacked under
Rivest’s definition of security of an AONT, and even under stronger
notions does not appear provable. We show however that by using a OAEP
as the AONT one can prove security. We also present a different scheme,
still using AONTs, that is equally efficient and easily proven secure
even under the original weak notion of security of AONTs.
ePrint: https://eprint.iacr.org/2000/010
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