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Public-Key Encryption with Registered Keyword Search

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Public Key Infrastructures, Services and Applications (EuroPKI 2009)

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Abstract

Public-key Encryption with Keyword Search (PEKS) enables a server to test whether a tag from a sender and a trapdoor from a receiver contain the same keyword. In this paper, we highlight some potential security concern, i.e. a curious server is able to answer whether any selected keyword is corresponding to a given trapdoor or not (called an offline keyword guessing attack). The existing semantic security definition for PEKS does not capture this vulnerability. We propose a new concept, namely Public-key Encryption with Registered Keyword Search (PERKS), which requires a sender to register a keyword with a receiver before the sender can generate a tag for this keyword. Clearly the keyword preregistration is a disadvantage. The payback is that the semantic security definition for PERKS proposed in this paper is immune to the offline keyword guessing attack. We also propose a construction of PERKS and prove its security. The construction supports testing multiple tags in batch mode, which can significantly reduce the computational complexity in some situations.

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Tang, Q., Chen, L. (2010). Public-Key Encryption with Registered Keyword Search. In: Martinelli, F., Preneel, B. (eds) Public Key Infrastructures, Services and Applications. EuroPKI 2009. Lecture Notes in Computer Science, vol 6391. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-16441-5_11

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  • DOI: https://doi.org/10.1007/978-3-642-16441-5_11

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-16440-8

  • Online ISBN: 978-3-642-16441-5

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