In message <Pine.BSI.3.95.980817105445.1266A-100000@mail1.i1.net>, you write:

Hi all,

I was hoping someone might be able to point me to details on .PDF file encryption. I'm specifically interested in key-generation (which hash is used?) and if there is consistant known-plaintext in .PDF file headers.

I've searched around, and all I can find is that Acrobat uses rc4, which isn't very helpful...

I don't have any info on this sort of thing, but you can check out the latest versions of Ghostscript (at least the 4.01 version I've got installed), it has ps2pdf conversion utils, might give you an idea on how they encode 'em. -- Michael Parson Systems Administrator IXC Communications, Inc. The Data Place - Austin