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
Current techniques
• Bruteforce – Trying each and every possible combination of
character set
• Dictionary– Making list most possible list of password and
trying them.
Problems with current technique
• It takes days to recover password• Resources needed to recover password are
much more • Computation required are more
Solution to problems
• Collusion avoidance technique– Chaining
• Smart hashing– Similar to dictionary attack
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