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Posted by Vladimir Katalov on May 5, 2006, 5:53 am
If you were Registered and logged in, you could reply and use other advanced thread options > Is it possible to retrieve a password protected document (Excel, Word). A
> user quit the company and had a very important doc, but we can't access
> it.
> Thank you in advance for your suggestions / comments.
Word/Excel encryption (for "open" password) is relatively strong and based
on industry-standard MD5 and RC4 argorithms. The original password can
be recovered only with brute-force and dictionary attacks. They're
implemented
in many programs, e.g. "Advanced Office Password Recovery":
http://www.elcomsoft.com/aopr.html
The complete documentation on the product, including explanation of
password-protection methods and available attacks, is available online:
http://www.elcomsoft.com/help/aopr/
However, if password is long and well selected, it cannot be recovered in a
reasonable time. However, in Word/Excel 97/2000 (and XP/2003 with
default/compatible encryption), the 40-bit encryption keys are used (due
to U.S. export regulations). Such files can be decrypted with 100% guarantee
regardless the password length and complexity; it takes up to 2 weeks on a
single PC using another software:
http://www.elcomsoft.com/aopb.html
--
Sincerely yours,
Vladimir
Vladimir Katalov
CEO
ElcomSoft Co.Ltd.
mailto:vkatalov@elcomsoft.com
http://www.elcomsoft.com
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