Self-promotion admitted, but the Bump app is interesting for IM/picture/file etc capabilities (though not voice) in this arena. A few points: * Everything i

Self-promotion admitted, but the Bump app is interesting for IM/picture/file etc capabilities (though not voice) in this arena. A few points: * Everything is tunneled over OpenSSL and (increasingly) NaCL. * We do not use the CA infrastructure... we ship our server's public key in the app * Communication channels are established by a face-to-face "bump", and the parties must mutually consent that the suggested "match" was their intended counter party (they must validate name and mug). * Subsequent communications can happen asynchronously at a distance on this channel Basically, one of the things we've explored in house and with partners is that we've "accidentally" created something with properties (though not yet rigorously vetted to endorse for specific use cases) that lead to everyday users having exercised some practices normally reserved for the technical and paranoid--such as identity based on an initial in-person exchange.