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A first generic comment is that when you give a key to a friend, there is no way you can prevent that "friend" from sending the same key to other people, or blabbering about your semi-private information. In that sense, encryption cannot make a useful distinction between "keyF" and "keyA". In a security setting, there are only two categories of information: ...


3

The security is only as effective as your trust in your friends to not share it. Distributed systems like this have been thought up before, but adoption is a challenge. You actually really want the information to be replicated across multiple servers so that you have redundancy and can track a graph of where it is. Another alternative idea is that you ...



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