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Time and again, attribute-based encryption has been shown to be the natural cryptographic tool for building various types of conditional access systems with far-reaching applications, but the deployment of such systems has been very slow. A central issue is the lack of an encryption scheme that can operate on sensitive data very efficiently and, at the same time, provides features that are important in practice. This paper proposes the first fully secure ciphertext-policy and key-policy ABEdoi:10.1145/3133956.3134014 dblp:conf/ccs/AgrawalC17 fatcat:ej5alnrkwjcqpdvtu7frgwj72y