Xiangyu Pan Fagen Li Public-key authenticated encryption with keyword search achieving both multi-ciphertext and multi-trapdoor indistinguishability. 102075 2021 115 J. Syst. Archit. https://doi.org/10.1016/j.sysarc.2021.102075 https://www.wikidata.org/entity/Q123189231 db/journals/jsa/jsa115.html#PanL21