[Gs-devel] Progress, not perfection, in pdf_sec.ps

rillian rillian at telus.net
Thu Sep 13 12:15:08 PDT 2001

An update on the progress implementing PDF 1.4 encryption:

Raph worked on the new keygen algorithms this week. The good news is 
that 128-bit decryption seems to work. The bad news is that the spec, 
including the private draft raph has for review, is badly broken. The 
algorithms for verifying the passwords are obviously flawed (e.g. 
comparing results after different numbers of encryption iteration) and 
unfortunately the obvious variations don't work either. So we're still a 
ways from perfection.

There are a couple of other things to try, and Raph is going to contact 
Adobe for clarification. The current work-in-progress pdf_sec.ps (with 
lots of debugging output) is attached below, if anyone else wants to 
take a look.


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