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Re:Show HN: File.io – Ephemeral file sharing by STRML on Wednesday July 29, 2015 @05:38PM (#9971760)
I built a service for this a few years back - it encrypts and decrypts on each side, all in JS. It's pretty quick with web workers.

https://securesha.re

Re:Show HN: File.io – Ephemeral file sharing by tattler on Thursday July 30, 2015 @02:01AM (#9973356)
This is close to something I keep meaning to make.

It would be awesome if I could download the file without the password to verify that it's stored encrypted though.

Re:Show HN: File.io – Ephemeral file sharing by STRML on Saturday August 08, 2015 @10:41AM (#10027334)
That could be faked. The best way to ensure I'm not cheating is to watch the network requests and to look at the code (https://github.com/STRML/securesha.re-client/tree/master/jqu...).

You'll see the POST to the server going up encrypted, and the subsequent GET when you download the file coming down encrypted as a binary XHR.