?The Centre for Computer and Information Security Research (CCISR) invites you to attend the Crypto Seminar with the following detail:
Date/time: Tuesday 15 Mar 1.30pm-2.30pm
Venue: 214 Infrastructure Security Lab, Smart Building
Title: Ciphertext-Policy Attribute-Based Encryption: An Expressive, Efficient, and Provably Secure Realization
Speaker: Tran Phuong
Note: The speaker is going to introduce the paper published by Brent Waters in PKC 2011.
Abstract: We present a new methodology for realizing Ciphertext-Policy Attribute Encryption (CP-ABE) under concrete and non -interactive 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 present three constructions within our framework. Our first system is proven selectively secure under an assumption that we call the decisional Parallel Bilinear Diffie-Hellman Exponent (PBDHE) assumption which can be viewed as a generalization of the BDHE assumption. Our next two constructions provide performance tradeoffs to achieve provable security respectively under the (weaker) decisional Bilinear-Diffie-Hellman Exponent and decisional Bilinear Diffie-Hellman assumptions.
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