The anatomy of a large-scale hypertextual Web search engine
WWW7 Proceedings of the seventh international conference on World Wide Web 7
Proceedings of the 9th international World Wide Web conference on Computer networks : the international journal of computer and telecommunications netowrking
Communications of the ACM
File System Design with Assured Delete
SISW '05 Proceedings of the Third IEEE International Security in Storage Workshop
SSYM'96 Proceedings of the 6th conference on USENIX Security Symposium, Focusing on Applications of Cryptography - Volume 6
FaceCloak: An Architecture for User Privacy on Social Networking Sites
CSE '09 Proceedings of the 2009 International Conference on Computational Science and Engineering - Volume 03
The ephemerizer: making data disappear
The ephemerizer: making data disappear
Vanish: increasing data privacy with self-destructing data
SSYM'09 Proceedings of the 18th conference on USENIX security symposium
EphPub: Toward robust Ephemeral Publishing
ICNP '11 Proceedings of the 2011 19th IEEE International Conference on Network Protocols
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The way we deal with information has changed significantly over the last years. More and more private data is published on the Internet, and at the same time our capacity to store and process data has vastly increased. Systems to prevent a large-scale data collection by placing an "expiration date" on digital data have been proposed before, but either they only support very short expiration times of a few days (such as Vanish and EphPub), or they require additional infrastructure (such as FaceCloak and X-pire). We propose a system that (i) implements expiration times of several month and does this (ii) based on existing infrastructure only; to the best of our knowledge this is the first system to have both properties at the same time. We exploit the fact that many webpages continuously change over time: We extract several key-shares from random webpages and use a threshold secret sharing scheme to reconstruct the correct key if enough webpages have not yet changed. After several month, enough webpages have changed to completely hide the key. For almost a year, we have collected statistics about the changes of webpages on a large random sample of webpages and have shown that expiration times of several month can be implemented reliably.