1957 shaares
crack password protected office files
http://linuxfr.org/users/oumph/journaux/v%C3%A9rifier-ou-retrouver-un-mot-de-passe-sur-un-fichier-xlsdoc-avec-pseudo-s%C3%A9curit%C3%A9-xor
office2john https://github.com/magnumripper/JohnTheRipper
Decrypting Open Office documents http://www.lyquidity.com/devblog/?p=35
[MS-OFFCRYPTO]: Office Document Cryptography Structure http://msdn.microsoft.com/en-us/library/cc313071.aspx
vieil article, assez clair avec exemple: http://chicago.sourceforge.net/devel/docs/excel/encrypt.html
