Ciphertext-policy attribute-based encryption: an expressive, efficient, and provably secure realization
作者： Brent Waters
DOI: 10.1007/978-3-642-19379-8_4
关键词: Provable security 、 Ciphertext 、 Theoretical computer science 、 Access structure 、 Cryptography 、 Generic group model 、 Standard model (cryptography) 、 Attribute-based encryption 、 Mathematics 、 Encryption
摘要: We present a new methodology for realizing Ciphertext-Policy Attribute Encryption (CP-ABE) under concrete and noninteractive cryptographic assumptions in the standard model. Our solutions allow any encryptor to specify access control in terms of any access formula over the attributes in the system. In our most efficient system, ciphertext size, encryption, and decryption time scales linearly with the complexity of the access formula. The only previous work to achieve these parameters was limited to a proof in the generic group model. We …
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