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SUMMARY:A Framework for the Analysis of Mix-Based Steganographic File Syst
 ems - Claudia Diaz - Department of Electrical Engineering (ESAT)\, K.U.Leu
 ven\, Belgium
DTSTART:20090128T141500Z
DTEND:20090128T151500Z
UID:TALK15377@talks.cam.ac.uk
CONTACT:Mateja Jamnik
DESCRIPTION:The goal of Steganographic File Systems (SFSs) is to protect u
 sers from coercion attacks by providing plausible deniability on the exist
 ence of hidden files. We consider an adversary who can monitor changes in 
 the file store and use this information to look for hidden files when coer
 cing the user. We outline a high-level SFS architecture that uses a local 
 mix to relocate files in the remote store\, and thus prevent known attacks
  that rely on low-entropy relocations. We define probabilistic metrics for
  unobservability and (plausible) deniability\, present an analytical frame
 work to extract evidence of hidden files from the adversary’s observatio
 n (before and after coercion\,) and show in an experimental setup how this
  evidence can be used to reduce deniability. \nThis work is a first step t
 owards understanding and addressing the security requirements of SFSs oper
 ating under the considered threat model\, of relevance in scenarios such a
 s remote stores managed by semi-trusted parties\, or distributed peer-to-p
 eer SFSs.\n\nFull paper:\n\nhttps://www.cosic.esat.kuleuven.be/publication
 s/article-1051.pdf\n
LOCATION:Lecture Theatre 1\, Computer Laboratory
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