JustMyFriends
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TL;DR
JustMyFriends ensures sharing among friends without revealing unencrypted data to anyone outside of a circle of trust, and provides full access privacy in the user's data access behavior.
Abstract
A major obstacle to using Cloud services for many enterprises is the fear that the data will be stolen. Bringing the Cloud in-house is an incomplete solution to the problem because that implies that data center personnel as well as myriad repair personnel must be trusted. An ideal security solution would be to share data among precisely the people who should see it ("my friends") and nobody else.
