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seen Jan 27 '13 at 1:26

comment Computer appliance protocol
@PaĆ­loEbermann, my messages sended one-by-one and infrequently so every time I need to send a message, C ans S must do the handshake, send the payload and break the connection, so if a payload is a few bytes, the TLS is too cost for me.
comment Data-validating protocol
@fgrieu: of course I just can authenticate Alice as it always sends valid messages, but my conditions are weaker as I mentioned in question and I dont want to implement any behaviour that can implies impossibility of not authenticated participants to send valid messages.