Date: Fri, 13 Apr 2007 16:14:34 -0600
From: Dan Cosper <dcosper@cs.unm.edu>
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To: colloquia@cs.unm.edu
Subject: [Colloquia] Colloquium on Thursday, April 19, 2007
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*Title:* POTSHARDS: Secure Long-Term Archival Storage Without
Encryption
*Date: *Thursday, April 19, 2007
*Time:* 11 am 12:15 pm
*Place:* ECE 118
Ethan L. Miller <http://www.cse.ucsc.edu/%7Eelm/>, University of
California at Santa Cruz
Modern archival storage systems either store data in the clear,
ignoring security, or rely on keyed encryption to ensure privacy.
However, the
use of encryption is a major concern when data must be stored an
indefinite period of time - key management becomes increasingly
difficult as file lifetimes increase, and data loss becomes
increasingly likely because keys are a single point of failure and
losing a key is
comparable to data deletion. Moreover, traditional systems are
subject to the obsolescence of encryption algorithms themselves,
which can
expose petabytes of data the instant a cryptographic algorithm is
broken.
To address these concerns, we developed POTSHARDS, an archival
storage system that addresses the long-term security needs of data
with very
long lifetimes without the use of encryption. POTSHARDS separates
security and redundancy by utilizing two levels of secret splitting
in a
way that allows the original data to be reconstructed from the
stored pieces. However, the data structures used in POTSHARDS are also
designed in such a way that an unauthorized user attempting to
collect sufficient shares to reconstruct any data will not go
unnoticed. An
evaluation of our POTSHARDS implementation shows that it stores and
retrieves data at 2.5-5 MB/s, demonstrates its ability to recover user
data given all of the pieces a user has stored across the archives,
and shows its ability to recover from the loss of an entire archive.
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