Protecting Free Expression Online with Freenet
IEEE Internet Computing
Keying Hash Functions for Message Authentication
CRYPTO '96 Proceedings of the 16th Annual International Cryptology Conference on Advances in Cryptology
Practical Techniques for Searches on Encrypted Data
SP '00 Proceedings of the 2000 IEEE Symposium on Security and Privacy
Protecting Privacy in Key-Value Search Systems
ACSAC '06 Proceedings of the 22nd Annual Computer Security Applications Conference
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
Secure anonymous database search
Proceedings of the 2009 ACM workshop on Cloud computing security
CAPTCHA: using hard AI problems for security
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Deterministic and efficiently searchable encryption
CRYPTO'07 Proceedings of the 27th annual international cryptology conference on Advances in cryptology
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Existing content aggregators provide fast and efficient access to large volumes of shared data and serve as critical centralized components of many peer-to-peer systems, including content discovery for BitTorrent. These aggregators' operators are tasked to spend significant human resources to manually vet uploaded data to ensure compliance with copyright laws. This task does not scale with today's increasing demand for such services. In this paper, we introduce Blindfold, a scheme to ensure that the operators of content aggregators are completely blind to the content that they are storing and serving, thereby eliminating the possibility to censor content at the servers. It works by partitioning the search and upload operations into a series of dependent key-value operations across servers under different administrative domains, with the connection between servers obfuscated using captchas. We have implemented a prototype of Blindfold to show that it is a simple, feasible, and efficient system for serving content that is opaque to the storage servers.