Posts Tagged ‘Encryption’

Adobe PDF File Security and Password

Saturday, February 6th, 2010

2009-01-22 Initial Post

As simple as it seemed, I couldn't find any good info on PDF file security, so I did some research on it and here are my notes:

From what I’ve read so far, 128-bit RC4, when used as the user password (password to allow opening the PDF file) is not feasibly crackable if a complex password is used. There are some utilities that can crack the master/owner password (password that restricts printing, copying text, modifying, etc.), but they can’t feasibly crack a complex user password. (more…)