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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Fully Homomorphic Message Authenticators
verfasst von : Rosario Gennaro, Daniel Wichs
Erschienen in: Advances in Cryptology - ASIACRYPT 2013
Verlag: Springer Berlin Heidelberg
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We define and construct a new primitive called a
fully homomorphic message authenticator
. With such scheme, anybody can perform arbitrary computations over authenticated data and produce a
short
tag that authenticates the result of the computation (without knowing the secret key). This tag can be verified using the secret key to ensure that the claimed result is indeed the correct output of the specified computation over previously authenticated data (without knowing the underlying data). For example, Alice can upload authenticated data to “the cloud”, which then performs some specified computations over this data and sends the output to Bob, along with a short tag that convinces Bob of correctness. Alice and Bob only share a secret key, and Bob never needs to know Alice’s underlying data. Our construction relies on fully homomorphic encryption to build fully homomorphic message authenticators.