![]() Until Office 2010, Excel used an outdated hashing algorithm to protect our passwords. ![]() However, it is impossible to recover your exact sheet or workbook structure passwords, even if your Excel files are hacked and the hash is revealed, as hashes cannot be reversed by design. If you have lost your password, the only alternative short of recreating the file, is to crack the hash. If the two hashes match, the sheet is unprotected. So when you attempt to unprotect a sheet, Excel computes the hash of the password entered against the hash of the original password stored inside the OpenXML file. Even a minor change in the source input results in a completely different output. Hash algorithms are one-way functions that convert passwords to a fixed length text that cannot be reversed. To safeguard your original password against hacking, Excel does not save the user's real password inside the OpenXML file, but a cryptographic hash. As in previous Office versions, worksheets and the workbook's structure in Excel 2007 or later are protected using a password.
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