@inproceedings{41c92f41b8f5402a98cb40982b6f2593,
title = "Unbounded ABE via bilinear entropy expansion, revisited",
abstract = "We present simpler and improved constructions of unbounded attribute-based encryption (ABE) schemes with constant-size public parameters under static assumptions in bilinear groups. Concretely, we obtain: a simple and adaptively secure unbounded ABE scheme in composite-order groups, improving upon a previous construction of Lewko and Waters (Eurocrypt {\textquoteright}11) which only achieves selective security;an improved adaptively secure unbounded ABE scheme based on the k-linear assumption in prime-order groups with shorter ciphertexts and secret keys than those of Okamoto and Takashima (Asiacrypt {\textquoteright}12);the first adaptively secure unbounded ABE scheme for arithmetic branching programs under static assumptions. At the core of all of these constructions is a “bilinear entropy expansion” lemma that allows us to generate any polynomial amount of entropy starting from constant-size public parameters; the entropy can then be used to transform existing adaptively secure “bounded” ABE schemes into unbounded ones.",
author = "Jie Chen and Junqing Gong and Lucas Kowalczyk and Hoeteck Wee",
note = "Publisher Copyright: {\textcopyright} International Association for Cryptologic Research 2018.; 37th Annual International Conference on the Theory and Applications of Cryptographic Techniques, EUROCRYPT 2018 ; Conference date: 29-04-2018 Through 03-05-2018",
year = "2018",
doi = "10.1007/978-3-319-78381-9\_19",
language = "英语",
isbn = "9783319783802",
series = "Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)",
publisher = "Springer Verlag",
pages = "503--534",
editor = "Nielsen, \{Jesper Buus\} and Vincent Rijmen",
booktitle = "Advances in Cryptology - EUROCRYPT 2018 - 37th Annual International Conference on the Theory and Applications of Cryptographic Techniques, 2018 Proceedings",
address = "德国",
}