If I can decrypt or "unprotect" a sheet or a workbook in Excel in a matter of 2-3 minutes (faster then it usually takes to read the linked article!), by a means of simple .zip archive modification then should Office 2007+ files be still treated as secure?
To make things even more sad, I can modify contents of such "protected" document without anyone knowing this.
- Can we consider sheet or workbook protection in security means or do these two things have nothing in common?
- How it is possible that such "feature" exists for 13+ years and Microsoft did nothing about it?
- Is anyone using this feature? If yes, then for which reasons, if it can be broken by a kid?
Note that I am not asking about Office document's encryption and decryption. I am talking precisely about "protecting" a sheet or workbook with a password where contents of such "protected" document can be revealed by a person having 10+ years old child IT knowledge, by simple .zip file modification.
A question quite similar to my now seven years old one about .zip files itself.