We (My Boss and I) are assessing the security of Excel password protection for Microsoft Excel 2016 versus complete end to end encryption via something like OpenPGP. We currently send files via email using Excel workbook (not sheets) encryption. Can any one please comment on how secure Excel encryption is and the methods of circumventing Excel encryption for the purposes of demonstration for my boss. I have found links indicating how easy it is to break, are the contributors correct? - Thanks in advance.