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Erschienen in:
2014 | OriginalPaper | Buchkapitel
Multi-input Functional Encryption
verfasst von : Shafi Goldwasser, S. Dov Gordon, Vipul Goyal, Abhishek Jain, Jonathan Katz, Feng-Hao Liu, Amit Sahai, Elaine Shi, Hong-Sheng Zhou
Erschienen in: Advances in Cryptology – EUROCRYPT 2014
Verlag: Springer Berlin Heidelberg
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We introduce the problem of Multi-Input Functional Encryption, where a secret key
sk
f
can correspond to an
n
-ary function
f
that takes multiple ciphertexts as input. We formulate both indistinguishability-based and simulation-based definitions of security for this notion, and show close connections with indistinguishability and virtual black-box definitions of obfuscation.
Assuming indistinguishability obfuscation for circuits, we present constructions achieving indistinguishability security for a large class of settings. We show how to modify this construction to achieve simulation-based security as well, in those settings where simulation security is possible.