Tmto pdf cracker
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null Pune April 2012 Meet

null Pune April 2012 Meet

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Tmto pdf cracker Presentation Transcript

  • 1. Tmto pdf cracker
  • 2. What is PDF• Portable document format• Open standard for documentation• By adobe systems in 1993• Complete description of fixed layout flat document, text graphics ,fonts and other information• Was proprietary then became official in 2008
  • 3. File structure• 8 tyes of object – Boolean – Strings arrays – Names – Dictionaries – Streams
  • 4. Encryption• What to encryption• What to encrypt• Types of encryption
  • 5. Current techniques• Bruteforce – Trying each and every possible combination of character set• Dictionary – Making list most possible list of password and trying them.
  • 6. Problems with current technique• It takes days to recover password• Resources needed to recover password are much more• Computation required are more
  • 7. New concept• TIME MEMORY TRADE OFF – What is it? – Why
  • 8. Benefits of TMTO• Less time to recover password• Less computation required
  • 9. Problems with TMTO• Hash collision• Huge disk space
  • 10. Solution to problems• Collusion avoidance technique – Chaining• Smart hashing – Similar to dictionary attack
  • 11. Internal Modules for recovery utility
  • 12. Internal modules for RB Generation
  • 13. Advantages & Disadvantages
  • 14. Future Development