Social: LOAF is ‘a way to share your address book without abandoning your privacy.’

A nifty use of Bloom filters to share your address book in a one-way manner — when you receive a mail, you can query your LOAF db to see if any of your correspondents previously corresponded with the sender; but they cannot look up the LOAF file to determine your correspondents, unless they know that correspondent’s email address in advance.

This, BTW, would be a very good way to implement a ‘Do-Not-Email’ list — although the other two problems with those still apply.

Interesting stuff — although I wonder how acceptable the 4-8Kb MIME part overhead per message will be…

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