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1

I'm not a security expert but my reasoning is the following: If you encrypt the information using shared key (known to you) then you can decrypt data on server and compare it. If you encrypt data on the clients using individual keys you can not decrypt the data but you cannot compare them. I see two solutions Simple - hash the data (using shared secret) - ...


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I will assume that clients answer a series of n boolean questions. The server stores their answers in such a way that you that admin can not know their responses. Then the server identifies pairs of clients with identical responses. Then could not you the admin (or anyone really) create 2^n dummy accounts (all possible responses to the boolean questions). ...



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