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Re:Ask HN: How to securely send documents by mathie25 on Tuesday April 17, 2018 @10:27PM (#16864141)
Depends on the usage, but you could use Firefox Send https://send.firefox.com/

It's also open source

Re:Ask HN: How to securely send documents by hackermailman on Wednesday April 18, 2018 @10:57AM (#16867878)
Signal App you can send attachments now of any arbitrary file type.