[14529] in Cypherpunks
Re: breaking encryption in microsoft word...
daemon@ATHENA.MIT.EDU (Hadmut Danisch)
Wed Jun 1 12:13:54 1994
Date: Wed, 1 Jun 1994 18:04:02 --100
From: danisch@ira.uka.de (Hadmut Danisch)
To: cypherpunks@toad.com
> A client of mine has lost the password to a Microsoft Word v6
> document. I've found stuff on the net to crack Wordperfect, and
> pointers to stuff to crack Lotus 1-2-3, Quatro-Pro, MS Excel and
> Paradox, but nothing on Microsoft Word. Does Word use real
> cryptography, or does someone out there have a way to break it pretty
> quickly?
Some months ago there was an article in a german computer magazine about
the Microsoft Excel chiffre. If I remember well it was a simple thing:
Every byte is rotated by two (?) bits and then a 12-character password
is xored cyclic (vigenere-chiffre). The format of the file should be
enough to do a known-plaintext-attack. Doesn't have the Microsoft word
document a lot of 0-Bytes within the first hundred bytes?
Hadmut
