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-
- Microsoft Word Document Unprotect Program
- -----------------------------------------
-
- Word has a fairly simpleminded encryption facility you can use
- to protect your documents from prying eyes. Unfortunately,
- three seconds with the hex dump of a "protected" file will
- tell you how it's done, and how to undo it without knowing the
- passphrase.
-
- In any case, I went to work building wu.exe because I had
- forgotten a passphrase I used to protect an important document
- I quickly discovered that Word's protection was useless, got
- my document back, and started using better encryption.
-
- I still don't know what the passphrase was that I used on my
- document, because wu.exe doesn't need to know it. It just
- builds a new file with the encryption removed. I decided to
- publish this mainly to make the point that it is probably a
- very bad idea to depend on Word to protect confidential
- information.
-
- There are two versions in this packet; one for Windows and one
- for DOS. Copy the one you want to use to wu.exe in some
- directory on your path.
-
- winwu.exe is a Windows App, so you can only run it
- from Windows.
-
- doswu.exe is a DOS app which will run from DOS or
- Windows.
-
- WU.EXE WILL NOT CHANGE YOUR DOCUMENT. It will
- only create a new one with the name you specify.
-
- When you want to unprotect a document whose passphrase you
- have forgotten (or convince somebody that they should get
- better security), use the [File,Run] menu item in Program
- Manager or File Manager and enter the line
-
- wu infile outfile
-
- replacing infile and outfile with the names of the file you
- want unprotected and of the resulting unprotected file. If
- everything goes well, the output file will simply appear in
- the current directory, or where you specified if you included
- a path in the file name. If something went wrong, you'll get a
- message in a window that stays open until you close it. Sorry,
- no fancy dialog boxes; the program is really expecting to be
- launched by a command-line interpreter (I use and recommend
- Eschalon's WinCLI Pro).
-
- The encryption/decryption technical details are contained in
- the comments to the source code file.
-
- The source code was compiled with Turbo C++ for Windows and
- Zortech C++ for DOS, but I've tried to keep it generic. It
- should compile under any C++ compiler with few if any changes.
-
- NOTE:
- I haven't tested this on a huge number of Word documents; just
- a bunch created with Word for Windows Versions 1 and 2. There
- may be some version or versions that use the part of the
- header record that wu.exe expects to find all zero. If this
- happens, wu.exe will just refuse to function (with an
- appropriate message). I would appreciate a note from anyone
- who discovers such a situation or any other that interferes
- with decryption. The technique used is very simple and there
- is more technique that can be applied if this doesn't work in
- every case.
-
- COPYRIGHT, etc:
- This work is released into the Public Domain and may be freely
- used, distributed and copied. I would appreciate attribution
- when it is appropriate. It is released with all the usual
- disclaimers; in short, you are solely responsible for anything
- you do to yourself or anybody else with this program. If
- that's a problem you should erase it immediately.
-
- Authentication:
- The file doswu.sig contains a PGP Version 2 digital signature for
- doswu.exe. My key is published on the end of just about every
- message I put on a BBS or UseNet. You can't right off trust
- the key at the end of this file to authenticate doswu.exe, but
- you can use it to send me a message. If I can read the
- message, either you've got a trustworthy key or we are in deep
- doodoo with some very powerful people. If you live in the USA
- or France, where using PGP may be illegal, I can only
- sympathise. In any case, you can always recompile the source
- if you have any concern about the executable.
-
- HELLO MICROSOFT:
- If any of you are listening; it would be very nice if future
- versions of Winword had competent encryption that can't be
- broken by any kid who understands his Spiderman Secret Decoder
- Ring. A false sense of security is much worse than none at
- all. It misleads people into thinking that they have assured
- the confidentiality of their documents when they have in fact
- not, and should have used another method to do so. The best
- approach is to have winword call an external program to do the
- encryption. This would let us plug in our favourite
- cryptengine and save you a lot of hassle vis-a-vis export
- controls on useful crypto technology.
-
- ---
- Marc Thibault | Automation Architect | All we are saying
- marc@tanda.isis.org | R.R.1, Oxford Mills, | is give global
- CIS:71441,2226 | Ontario, Canada K0G 1S0 | warming a chance.
- NC FreeNet: aa185 | |
-
- -----BEGIN PGP PUBLIC KEY BLOCK-----
- Version: 2.0
-
- mQBNAiqxYTkAAAECALfeHYp0yC80s1ScFvJSpj5eSCAO+hihtneFrrn+vuEcSavh
- AAUwpIUGyV2N8n+lFTPnnLc42Ms+c8PJUPYKVI8ABRG0I01hcmMgVGhpYmF1bHQg
- PG1hcmNAdGFuZGEuaXNpcy5vcmc+
- =HLnv
- -----END PGP PUBLIC KEY BLOCK-----
-
-
-