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Zuo, C., Shao, J., Liu, Z., Ling, Y., Wei, G..  2017.  Hidden-Token Searchable Public-Key Encryption. 2017 IEEE Trustcom/BigDataSE/ICESS. :248–254.

In this paper, we propose a variant of searchable public-key encryption named hidden-token searchable public-key encryption with two new security properties: token anonymity and one-token-per-trapdoor. With the former security notion, the client can obtain the search token from the data owner without revealing any information about the underlying keyword. Meanwhile, the client cannot derive more than one token from one trapdoor generated by the data owner according to the latter security notion. Furthermore, we present a concrete hiddentoken searchable public-key encryption scheme together with the security proofs in the random oracle model.