Hi everyone,
I recently ran into a paper on convergent encryption, which is a way of
encrypting file blocks by their hashes. The hashes (keys) are stored
with the blocks, encrypted with the public key of any authorized
readers. This allows a server to pool identical files, as they end up
having identical encrypted blocks. This would allow BackupPC to still
work as it does now. Naturally, file size, location, quantity, etc are
visible but the contents wouldn't be.
I'm not sure if this has been suggested before, but a brief peruse of
the archives didn't turn anything up. It seems like the arguments
against encryption in the past found the pooling issue insurmountable.
I appended bibtex for the paper below.
Cody
@INPROCEEDINGS{Douceur02Reclaimingspacefrom,
author = {J.~R. Douceur and A. Adya and W.~J. Bolosky and P. Simon
and M. Theimer},
title = {Reclaiming space from duplicate files in a serverless
distributed
file system},
booktitle = {ICDCS '02: Proc. 22nd International Conference on
Distributed Computing
Systems},
year = {2002},
pages = {617--624},
month = {2--5 July },
abstract = {The Farsite distributed file system provides availability
by replicating
each file onto multiple desktop computers. Since this replication
consumes significant storage space, it is important to reclaim used
space where possible. Measurement of over 500 desktop file systems
shows that nearly half of all consumed space is occupied by duplicate
files. We present a mechanism to reclaim space from this incidental
duplication to make it available for controlled file replication.
Our mechanism includes: (1) convergent encryption, which enables
duplicate files to be coalesced into the space of a single file,
even if the files are encrypted with different users' keys; and (2)
SALAD, a Self-Arranging Lossy Associative Database for aggregating
file content and location information in a decentralized, scalable,
fault-tolerant manner. Large-scale simulation experiments show that
the duplicate-file coalescing system is scalable, highly effective,
and fault-tolerant.},
doi = {10.1109/ICDCS.2002.1022312},
url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1022312}
}
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