I regularly need to send files (usually MS Office, PDF or images) with sensitive information to clients via email and am looking for a good way to protect these documents. The main aim is having a safeguard in case of inadvertently emailing to the wrong recipient (which can happen all too easily with autocomplete etc).
The solution needs to be very user-friendly: it should be cross-platform (i.e. work for both Windows and Mac users), and it is not an option to require clients to install software.
One solution I have considered is to use an encrypted .zip folder into which the files could be placed. This would be pretty convenient, as individual files don’t need to be protected one by one, and files can be freely used once outside the .zip folder.
This approach would work well for clients on Windows, as long as the .zip folder encryption method is ZipCrypto. I know ZipCrypto is not the most secure of encryption methods, but it is sufficient for our purposes. So that leaves Mac users, but I cannot seem to find any information online as to whether Mac OS can open ZipCrypto-encrypted .zip folders.
1) Does anyone know if Mac OS can open ZipCrypto-encrypted .zip folders ?
2) Or, is there a better solution that I am unaware of ?