![]() This kind of protection can easily be bypassed by a skilled user by modifying the XLSX file. ![]() Microsoft explicitly states that "Worksheet level protection is not intended as a security feature". This is what Microsoft calls "Protect a workbook" and "Protect a worksheet". earlier versions of Office used various algorithms which are now considered insecure.Office 2007–2013 uses 128-bit AES for Office Open XML files.RC4 (considered insecure) when encrypting files in the legacy formats (doc, xls.256-bit AES when encrypting Office Open XML files (docx, xlsx.This feature encrypts the whole file with symmetric encryption: There are two fundamentally different ways to "protect an Excel sheet with a password".įile encryption: This is what Microsoft calls "Protect an Excel file". In the existing answers, a lot of "Excel is not secure" gets thrown around, so let's look at what this means in detail.įirst, we need to establish which Excel feature we are talking about.
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