>>>I don't know of any simple way to securely transfer files which is suitable for general end users. I'd be interested to hear if anyone else has found anything. For example, I've used:
>>>
>>>- 7Zip encrypted archives as e-mail attachments. This requires the recipient to install 7Zip
>>
>>10 years ago clients used Winzip encryption, which was easy to crack.
>>Have not looked at 7zip in depth: as it uses AES256 should be trustworthy ?
>>There were Crackers for encrypted WinZip Containers - one seems to exist for 7zip.
>
>The security seems to rely on a strong key/password:
>
>
https://security.stackexchange.com/questions/240072/are-files-encrypted-with-7zip-vulnerable-to-password-crackers>
https://www.youtube.com/watch?v=xVBXwflFzIU>
>Cracking seems to depend on wordlists or rainbow tables, which become infeasible with strong keys/passwords.
https://xkcd.com/936/alone might leave you vulnerable, so mix it up...
Although I might miss out on the service Hank mentioned
