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Find encryption keys for Microsoft Excel XP/2002/2003 files

This program may be used to break the encryption on Microsoft Excel XP/2002/2003 files which have been encrypted using the RC4 method. These files are encrypted using a 40-bit-long key. It will not work on files encrypted using later versions or versions 8.0 or earlier.



Verified by

Verified on


Verified by


Verified on

8 March 2013


OpenSSL linking exception -

In addition to the licences above, as a special exception, I (Gavin Smith) give permission to link the code of this program with the OpenSSL library and distribute linked combinations including the two. Other restrictions may apply, such as those due to the rights of other copyright holders.

You must obey the GNU General Public License (or any other applicable licence for included code, such as the BSD-style licence of the files from the POLE project) for all of the code used other than OpenSSL.

This exception does not reduce the rights already granted to you by the GNU General Public License: in particular, you may extend this exception

to derived works, but you are not obligated to do so.

Leaders and contributors

Gavin Smith Maintainer

Resources and communication

Software prerequisites

Required to buildOpenSSL


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.