EldoS | Feel safer!

Software components for data protection, secure storage and transfer

decrypt pdf with empty password

Also by EldoS: Solid File System
A virtual file system that offers a feature-rich storage for application documents and data with built-in compression and encryption.
#7275
Posted: 08/12/2008 09:22:59
by Jean-Marc BOTTURA (Standard support level)
Joined: 06/05/2008
Posts: 3

hello,
is it normal that a pdf document which has been encrypted with an owner password only (no user password) can be decrypted by passing an empty password ?
Thanks in advance.
#7276
Posted: 08/12/2008 10:16:57
by Dmytro Bogatskyy (EldoS Corp.)

Quote
is it normal that a pdf document which has been encrypted with an owner password only (no user password) can be decrypted by passing an empty password ?

Yes. It is common case when owner password used to prevent document modification (or to set other permissions), in this case user password is an empty string, so Adobe Acrobat could open it like a normal document.
In case if owner password will be an empty string, then user password will be used as owner password.
#7277
Posted: 08/12/2008 10:37:33
by Jean-Marc BOTTURA (Standard support level)
Joined: 06/05/2008
Posts: 3

so what's the utility of the owner password if you can decrypt and modify permissions (or maybe even owner password ?) by passing an empty password without knowing the original owner password ?
#7278
Posted: 08/12/2008 12:50:53
by Dmytro Bogatskyy (EldoS Corp.)

Quote
so what's the utility of the owner password if you can decrypt and modify permissions (or maybe even owner password ?) by passing an empty password without knowing the original owner password ?

Well, you can decrypt and remove permissions with user password only (omit owner password) using SecureBlackbox, but you can't do this with Adobe Acrobat. It is Adobe security...
In program, if you want, you can achieve the same functionality as Adobe checking permissions and password type.

Reply

Statistics

Topic viewed 1990 times

none




|

Back to top

As of July 15, 2016 EldoS Corporation will operate as a division of /n software inc. For more information, please read the announcement.

Got it!