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I think the point it to avoid having to trust the server. If you can trust the server not to do malicious things with the data, then you can do any number of techniques.

This post is about how to do contact lookup without having to trust the server to maintain privacy.

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As I see it, the biggest current threat is bruteforcing of this service, at least based on the recent snapchat attack. And implementing rate limiting would solve this issue.

And given that this is a very hard problem to solve this kind of solution could be a good bandaid. Anyhow, this is at least my 2 cents on this issue.

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