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18604 Searching Keywords with Wildcards on Encrypted Data
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Sedghi, S. and van Liesdonk, P. and Nikova, S.I. and Hartel, P.H. and Jonker, W. (2010) Searching Keywords with Wildcards on Encrypted Data. In: Proceedings of the Seventh international Conference on Security and Cryptography for Networks (SCN), 13-15 September 2010, Amalfi, Italy. pp. 138-153. Lecture Notes in Computer Science 6280. Springer Verlag. ISBN 978-3-642-15316-7

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A hidden vector encryption scheme (HVE) is a derivation of identity-based encryption, where the public key is actually a vector over a certain alphabet. The decryption key is also derived from such a vector, but this one is also allowed to have "*" (or wildcard) entries. Decryption is possible as long as these tuples agree on every position except where a "*" occurs.

These schemes are useful for a variety of applications: they can be used as a building block to construct attribute-based encryption schemes and sophisticated predicate encryption schemes (for e.g. range or subset queries).
Another interesting application -- and our main motivation -- is to create searchable encryption schemes that support queries for keywords containing wildcards.

Here we construct a new HVE scheme, based on bilinear groups of prime order, which supports vectors over any alphabet.
The resulting ciphertext length is equally shorter than existing schemes, depending on a trade-off. The length of the decryption key and the computational complexity of decryption are both constant, unlike existing schemes where these are both dependent on the amount of non-wildcard symbols associated to the decryption key. Our construction hides both the plaintext and public key used for encryption. We prove security in a selective model, under the decision linear assumption.

Item Type:Conference or Workshop Paper (Full Paper, Talk)
Research Group:EWI-DIES: Distributed and Embedded Security, EWI-DB: Databases
Research Program:CTIT-ISTRICE: Integrated Security and Privacy in a Networked World
Research Project:SEDAN: Searchable Data Encryption
ID Code:18604
Deposited On:19 October 2010
More Information:statisticsmetis

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