The knowledge complexity of interactive proof systems
SIAM Journal on Computing
Software protection and simulation on oblivious RAMs
Journal of the ACM (JACM)
Foundations of Cryptography: Basic Tools
Foundations of Cryptography: Basic Tools
The Decision Diffie-Hellman Problem
ANTS-III Proceedings of the Third International Symposium on Algorithmic Number Theory
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
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We introduce WORM-ORAM, a first mechanism that combines Oblivious RAM (ORAM) access privacy and data confidentiality with Write Once Read Many (WORM) regulatory data retention guarantees. Clients can outsource their database to a server with full confidentiality and data access privacy, and, for data retention, the server ensures client access WORM semantics. In general simple confidentiality and WORM assurances are easily achievable e.g., via an encrypted outsourced data repository with server-enforced read-only access to existing records (albeit encrypted). However, this becomes hard when also access privacy is to be ensured - when client access patterns are necessarily hidden and the server cannot enforce access control directly.WORM-ORAM overcomes this by deploying a set of zero-knowledge proofs to convince the server that all stages of the protocol are WORM-compliant.