Understand the security of password vs. certificate

Howdy,

A customer is currently using the protection password on all PDFs on their website. Visitors can download the PDF files, print, copy text, they just can't edit PDF files. someone in their organization has forgotten the password - rather than recover from someone else in the Organization, they used a PDF password removal tool. Now, the organization wondered if they should step up their efforts, because these password removal tools exist.

Would be certificate encryption work in their case where where their site visitors may still see/print/etc but not edit PDF files? What happens if someone inside the organization needs to unlock it for some reason any? Is it a pain to get the certificate with the permissions to change the PDF file? I don't know that I would ask all the right questions...

Thank you!

In your case, you're talking restrictions "permissions" on a PDF file, if the file can be opened by anyone but has print, copy, etc.* controls

First thing; permission by password settings are not at all course. It is trivial to remove them, and only Adobe software guarantees to respect them in the first place. They are an illusion of security that tends to convince most people not to try to circumvent restrictions, but if someone wants it will take 30 seconds.

Based on encryption certificates use the identification number of the recipient, not the creator - so it will work if you get each recipient in advance your digital ID and cannot be used for official documents on a Web site. It can also be removed without access to the private key, but it takes a lot more effort to do.

Digital rights management (using Adobe ADEP / LiveCycle Rights Management servers) can protect a file against the printing and copying direct with no realistic possibility of the protection being removed, but it is extremely expensive.

However in all cases, if a page is visible on the screen it can be captured as a screengrab, then re-resulting to extract text. You can not extract media, scripts and vector objects, but something like a novel is totally impossible guarantee against copy, if it is distributed in an uncontrolled area.

* The 'open file' security on a file is another matter altogether - same password encryption is safe enough to be inviolable in a real scenario, if you use a complex string to prevent brute-force attacks.

Tags: Acrobat

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