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Published in:
2010 | OriginalPaper | Chapter
Anonymous Fuzzy Identity-Based Encryption for Similarity Search
Authors : David W. Cheung, Nikos Mamoulis, W. K. Wong, S. M. Yiu, Ye Zhang
Published in: Algorithms and Computation
Publisher: Springer Berlin Heidelberg
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In this paper, we consider the problem of predicate encryption and focus on the predicate for testing whether the Hamming distance between the attribute
X
of a data item and a target
V
is equal to (or less than) a threshold
t
where
X
and
V
are of length
m
. Existing solutions either do not provide attribute protection or produce a big ciphertext of size
O
(2
m
). For the equality version of the problem, we provide a scheme which is match-concealing (MC) secure and the sizes of the ciphertext and token are both
O
(
m
). For the inequality version of the problem, we give a practical scheme, also achieving MC security, which produces a ciphertext with size
$O(m^{t_{max}})$
if the maximum value of
t
,
t
max
, is known in advance and is a constant. We also show how to update the ciphertext if the user wants to increase
t
max
without constructing the ciphertext from scratch.