Journal
COMPUTER JOURNAL
Volume 58, Issue 4, Pages 986-1002Publisher
OXFORD UNIV PRESS
DOI: 10.1093/comjnl/bxu026
Keywords
searchable encryption; delegated equality test; multi-user setting; type 2 pairing
Categories
Funding
- National Natural Science Foundation of China [61370224, 61103232, 61272436, 61272404]
- Natural Science Foundation of Hubei Province [2013CFA046]
- Open Fund Program for State Key Laboratory of Information Security
- Guangdong Natural Science Foundation [S2013010011859, 10351806001000000]
- Research Fund for the Doctoral Program of Higher Education of China [20114404120027]
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Probabilistic public key encryption with equality test (PKEET), introduced by Yang et al. in CT-RSA 2010, is able to check whether two ciphertexts are encryptions of the same message under different public keys without leaking anything else about the message encrypted under either public key. PKEET schemes have many applications, for example, in constructing searchable encryption and partitioning encrypted data. Previous PKEET schemes lack a delegation mechanism for users to specify who can perform the equality test between their ciphertexts. In this paper, we propose the notion of public key encryption with delegated equality test (PKE-DET), which requires only the delegated party to deal with the work in a practical multi-user setting, and present a concrete construction in Type 2 pairing, which is provably secure under the newly introduced security notions.
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