You are aware that many popular services allow to share stuff privately using URL encoded credentials?
Add this to the 1,000,000 other reasons why you should never use GET requests for authentication/verification.
GET issues are primarily related to the fact that an attacker can automate their access. So they could trick a user into going to a specially crafted site, and then request content on that user's behalf via GET forgery, and return it to the web-server you control.
It is very convenient, but fairly insecure.
Sharepoint, DropBox, Owncloud, LogMeIn, Flickr, Google Docs, et al.
Private/one-time-use URLs have been a "thing" since practically forever and they're all over the place.
Would anyone here use a WebRTC-based service that also encrypted the file in transit, thus making it pretty hard for anyone other than the recipients to see it?
Then you have to give the URL to the recipient (over a secure channel), but the app will optionally allow you to not automatically send the file, but tell you how many people are connected (e.g. if there are two when you're expecting one) and begin transfer manually.
Also, I'm planning to make it all a single HTML file so you can download/verify it and store it somewhere to use whenever you like.
Of course, Skype's bot won't implement WebRTC.
They'll implement the proprietary blend that they told no one they were working on until everyone else was making serious progress with the implementation that everyone else collaborated on...
http://html5labs.interoperabilitybridges.com/prototypes/cu-r... [hm, they've actually put some money where their proposal is, I'll have to check into this more]
Obviously it's not going to be secure against coordinated attacks by governments (which I will also make clear), but my intention is to have it be secure enough for 99% of people while being easy to use. It'll at least be more secure than Dropbox/Box/Skype/whatever, which aren't secure in the slightest.
Mega, for example, might be secure, but I haven't personally seen their implementation, don't trust them not to implement any backdoors, and don't trust them not to change it. I'm aiming to make mine as small as possible, so you can verify it at pretty much a glance.