Office 2007 and later: password to open
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In Office 2007 Microsoft has significantly improved the password protection system.
Now the following applications allow to set the file opening password which is used to encrypt a document:
Word, Excel, PowerPoint, Access.
These programs use AES encryption algorithm and the SHA-1 hash is used in password verification. The password verification is now very slow. Only short and simple passwords can be recovered. In Office 2010 Microsoft doubled the number of SHA-1 hash iterations and therefore password recovery became two times slower.
In Office 2013 SHA-1 was replaced by SHA-512 - more complicated and significantly slower hash algorithm.
We recommend to use graphic cards (GPUs) to recover Office 2007+ passwords. Using of modern graphic card significantly increases the password recovery speed.
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