CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
Software protection and simulation on oblivious RAMs
Journal of the ACM (JACM)
Revocation and Tracing Schemes for Stateless Receivers
CRYPTO '01 Proceedings of the 21st Annual International Cryptology Conference on Advances in Cryptology
The LSD Broadcast Encryption Scheme
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
FOCS '95 Proceedings of the 36th Annual Symposium on Foundations of Computer Science
Secure untrusted data repository (SUNDR)
OSDI'04 Proceedings of the 6th conference on Symposium on Opearting Systems Design & Implementation - Volume 6
Simulatable Adaptive Oblivious Transfer
EUROCRYPT '07 Proceedings of the 26th annual international conference on Advances in Cryptology
Building castles out of mud: practical access pattern privacy and correctness on untrusted storage
Proceedings of the 15th ACM conference on Computer and communications security
Controlling Access to an Oblivious Database Using Stateful Anonymous Credentials
Irvine Proceedings of the 12th International Conference on Practice and Theory in Public Key Cryptography: PKC '09
Oblivious transfer with access control
Proceedings of the 16th ACM conference on Computer and communications security
EUROCRYPT'91 Proceedings of the 10th annual international conference on Theory and application of cryptographic techniques
CRYPTO'10 Proceedings of the 30th annual conference on Advances in cryptology
Private information retrieval using trusted hardware
ESORICS'06 Proceedings of the 11th European conference on Research in Computer Security
Efficient schemes for anonymous yet authorized and bounded use of cloud resources
SAC'11 Proceedings of the 18th international conference on Selected Areas in Cryptography
Practical privacy preserving cloud resource-payment for constrained clients
PETS'12 Proceedings of the 12th international conference on Privacy Enhancing Technologies
Outsourced private information retrieval
Proceedings of the 12th ACM workshop on Workshop on privacy in the electronic society
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In the past few years, outsourcing private data to untrusted servers has become an important challenge. This raises severe questions concerning the security and privacy of the data on the external storage. In this paper we consider a scenario where multiple clients want to share data on a server, while hiding all access patterns. We propose here a first solution to this problem based on Oblivious RAM (ORAM) techniques. Data owners can delegate rights to external new clients enabling them to privately access portions of the outsourced data served by a curious server. Our solution is as efficient as the underlying ORAM constructs and allows for delegated read or write access while ensuring strong guarantees for the privacy of the outsourced data. The server does not learn anything about client access patterns while clients do not learn anything more than what their delegated rights permit.