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Andreas, could you please return and close this question?<br />
@broomee9: there is not much more to be added but &quot;password protection is strong&quot; and that was said and supported by wikipedia's info.<br />
<br />
Why did you decide this is no solution?<br />
I object, since I think it very well serves as a solution.
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Hello, <br />
We (My Boss and I) are assessing the security &nbsp;of Excel password protection for Microsoft Excel 2016 versus complete end to end encryption via something like OpenPGP. &nbsp;We currently send files via email using Excel workbook (not sheets) encryption. &nbsp;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. &nbsp;I have found links indicating how easy it is to break, are the contributors correct? &nbsp;- Thanks in advance.<br />
<br />
Kind regards,<br />
ANH
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Hello, 
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.

Kind regards,
ANH

How secure is Microsoft Excel 2016 Email Encryption if the file is intercepted

Encryption is the process of encoding messages or information in such a way that only authorized parties can read it. In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.

Encryption

Microsoft Excel topics include formulas, formatting, VBA macros and user-defined functions, and everything else related to the spreadsheet user interface, including error messages.

Microsoft Excel

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.

Security

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.