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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.


A choice of implementation algorithms may be chosen using the --with-algo argument to configure.



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

This entry (in part or in whole) was last reviewed on 8 March 2013.


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