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Public key encryption with keyword search is a practical cryptographic paradigm that enables one to search for the encrypted keyword without compromising the security of the original data. Recently, Hwang et al. proposed a secure channel free public key encryption with conjunctive field keyword search (SCF-PECKS) scheme and claimed that their scheme can withstand the keyword guessing attack and does not need the secure channel. In this paper, by presenting three concrete attacks, we demonstratedoi:10.5755/j01.itc.47.1.16137 fatcat:kwwncghr2vgt7emjnf47277gha