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Erschienen in:
2016 | OriginalPaper | Buchkapitel
Key-Policy Attribute-Based Encryption for General Boolean Circuits from Secret Sharing and Multi-linear Maps
verfasst von : Constantin Cătălin Drăgan, Ferucio Laurenţiu Ţiplea
Erschienen in: Cryptography and Information Security in the Balkans
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Abstract
We propose a Key-policy Attribute-based Encryption (KP-ABE) scheme for general Boolean circuits, based on secret sharing and on a very particular and simple form of leveled multi-linear maps, called chained multi-linear maps. The number of decryption key components is substantially reduced in comparison with the scheme in [7], and the size of the multi-linear map (in terms of bilinear map components) is less than the Boolean circuit depth, while it is quadratic in the Boolean circuit depth for the scheme in [7]. Moreover, the multiplication depth of the chained multi-linear map in our scheme can be significantly less than the multiplication depth of the leveled multi-linear map in the scheme in [7]. Selective security of the proposed scheme in the standard model is proved, under the decisional multi-linear Diffie-Hellman assumption.