Publication Type

Journal Article

Publication Date

6-2017

Abstract

We present an encryption scheme for authorized equality test on ciphertexts (SEET), which allows the data owner to authorize a tester to compare her ciphertexts without decrypting their values. The security of SEET is formally proved against three types of adversary, two of them for ciphertext confidentiality in the phases before and after authorization respectively, and the third for token privacy. To the best of our knowledge, our SEET construction is the first encryption scheme supporting equality test on ciphertexts that is proven secure against the three types of adversary in the standard model. Our SEET construction outperforms existing schemes in terms of ciphertext size and encryption/decryption/testing costs. To show its application in set operations, we extend it into schemes for controlled set distance computation, such that a curious server is able to deduce the similarity/dissimilarity score between two encrypted user sets without knowing their elements.

Keywords

Data encryption, Equality test on ciphertexts, Data outsourcing, Private set intersection, Set operation, Implicit authentication

Discipline

Information Security | Programming Languages and Compilers

Research Areas

Cybersecurity

Publication

Information Sciences

Volume

414

First Page

289

Last Page

305

ISSN

0020-0255

Identifier

10.1016/j.ins.2017.06.008

Publisher

Elsevier

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Additional URL

https://doi.org/10.1016/j.ins.2017.06.008

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