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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Decentralized Attribute-Based Signatures
verfasst von : Tatsuaki Okamoto, Katsuyuki Takashima
Erschienen in: Public-Key Cryptography – PKC 2013
Verlag: Springer Berlin Heidelberg
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We present the first
decentralized
multi-authority attribute-based signature (DMA-ABS) scheme, in which no central authority and no trusted setup are required. The proposed DMA-ABS scheme for a large class of (non-monotone) predicates is fully secure (adaptive-predicate unforgeable and perfectly private) under a standard assumption, the decisional linear (DLIN) assumption, in the random oracle model. Our DMA-ABS scheme is comparably as efficient as the most efficient ABS scheme. As a by-product, this paper also presents an adaptively secure DMA functional encryption (DMA-FE) scheme under the DLIN assumption.