LOAF (site isn't responding at the moment; http://loaf.cantbedone.org http://loaf.cantbedone.org) used bloom filters in email attachments to determine common fr

LOAF (site isn't responding at the moment; http://loaf.cantbedone.org http://loaf.cantbedone.org) used bloom filters in email attachments to determine common friends without divulging your address book.