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Erschienen in:
2012 | OriginalPaper | Buchkapitel
Fully Private Revocable Predicate Encryption
verfasst von : Juan Manuel González-Nieto, Mark Manulis, Dongdong Sun
Erschienen in: Information Security and Privacy
Verlag: Springer Berlin Heidelberg
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We introduce the concept of
Revocable Predicate Encryption (RPE)
, which extends current predicate encryption setting with revocation support: private keys can be used to decrypt an RPE ciphertext only if they match the decryption policy (defined via attributes encoded into the ciphertext and predicates associated with private keys) and were not revoked by the time the ciphertext was created.
We formalize the notion of attribute hiding in the presence of revocation and propose an RPE scheme, called AH-RPE, which achieves attribute-hiding under the Decision Linear assumption in the standard model.
We then present a stronger privacy notion, termed
full hiding
, which further cares about privacy of revoked users. We propose another RPE scheme, called FH-RPE, that adopts the Subset Cover Framework and offers full hiding under the Decision Linear assumption in the standard model. The scheme offers very flexible privacy-preserving access control to encrypted data and can be used in
sender-local revocation
scenarios.