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- Microsoft Word doc encryption
February 14, 2007, 12:23 pm
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I need to carry a collection of log-on's & passwords on my laptop. I
have so many passwords now, I need to write them down.
How secure is a Word document which has been encrypted using Word's own
encryption? I have tried simple things like changing the document to ".txt"
& opening it in notepad, and it's still a bunch of random characters.
Great, but how secure?
Look forward to your replies.
- Sebastian Gottschalk
February 14, 2007, 12:29 pm
Re: Microsoft Word doc encryption
The standard encryption mechanism for Word97/2K/XP .doc format is
vulnerable to keystream leaking due to improper usage or the RC4 stream
cipher. Thus, if you edit a document, an attacker can extract an easily
separable combination of the previous and the new content.
The stronger, not backward compatible encryption offered since Office XP
and standard in Office 2003 seems to be useful.
Anyway, since .doc basically is a memory dump, you don't really know if not
the key ends up somewhere else, or some data remain unencrypted.
- Lawrence E. Oliver
February 14, 2007, 2:54 pm