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My presentation on PicFS. PicFS is an implementation of CovertFS. More specifically, it is a online file system that uses steganography to gain plausible deniability

My presentation on PicFS. PicFS is an implementation of CovertFS. More specifically, it is a online file system that uses steganography to gain plausible deniability

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PicFS presentation PicFS presentation Presentation Transcript

  • The S uper S ecret F ile S ystem CS851 – Web Application Security Seminar Chris Sosa Blake Sutton Howie Huang
  • Overview Implemented CovertFS on top of FUSE Automatic Image Selection from Video Used Tor to further protect users
  • Motivation
    • We have the right and the desire for privacy
    • We only trust our friends
  • Plausible Deniability
    • What can we do to provide privacy?
    • We want Plausible Deniability
      • Privacy is threatened whenever private information is known to exist
      • We can mask private activities with non-private ones
    What do you do if Nina isn’t one of your friends?
  • Related Work and their Issues
    • StegFS – Free Memory Blocks
      • Files were stored on the same system
      • No permanent storage guarantees
    • CovertFS – Online photo-sharing
      • Lacked way of getting images
      • Lacked implementation
      • User is compromised at same time as data
    He does not like bullets either
  • Image Generation
  • Anonymizing with Tor Onion Routing in Action I AM A MEDIA SERVER I <3 Privacy
  • Image Access Patterns
    • Mask our private file access patterns with non-private online image access
      • Online sites have open API’s that encourage 3 rd party applications
      • Mask our accesses to be similar to at least one such popular application
    • Techniques Used
      • See CovertFS
      • Image-based On-disk cache helps enormously here
  • File System Implementation
    • Based on Ext2
    • Uses Fuse-J library to take advantage of Java Serialization
    • Steganographic Algorithm replaceable (uses F5)
    • Allocation Table has paths for efficiency
    • Allocation table is chained especially (does not follow normal direct – indirect linkage)
    • Implemented Media Server
    • Image-based On-Disk Cache
      • Looks just like a subset of images from the Media Server
      • Permanently deleted on unmount
    Insert “Sexy” On-disk cache here Ext2
  • Implementation Issues
    • Allocation Table cannot act as a traditional special file (chicken-egg problem)
    • Flickr modifies uploaded images of Free Account holders
      • Grad students are poor
      • No restriction with $30 / year subscription
      • Easier to evaluate without Flickr
    • Tradeoff with privacy vs. efficiency between On-Demand downloading and Bulk Download
  • Evaluation (Future Work)
    • Image Generation
      • How many images selected
      • “ Uniqueness” of frames
      • Different video types (cartoon, home, television)
    I’m unique!
    • Traffic patterns
      • Media Server gathers data
      • Compare with existing API tools/apps
  • Demo
  • Conclusions
    • An anonyMizing Image-based Log File System is feasible!
    • Completely automatic image generation is practical if you have lots of videos ;) available as source material
  • Questions?