IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Online ISSN : 1745-1337
Print ISSN : 0916-8508
Regular Section
Cryptanalysis and Improvement of an Encoding Method for Private-Key Hidden Vector Encryptions
Fu-Kuo TSENGRong-Jaye CHEN
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2015 Volume E98.A Issue 9 Pages 1982-1984


A predicate encryption scheme enables the owner of the master key to enforce fine-grained access control on encrypted cloud data through the delegation of predicate tokens to cloud storages. In particular, Blundo et al. proposed a construction where a predicate token reveals partial information of the involved keywords to enable efficient operations on encrypted keywords. However, we found that a predicate token reveals more information than what was claimed because of the encoding scheme. In this letter, we not only analyze this extra information leakage but also present an improved encoding scheme for the Blundo et al's scheme and the other similar schemes to preserve predicate privacy.

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© 2015 The Institute of Electronics, Information and Communication Engineers
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