Sorry, I'm not a crypto guy. It seems that he sends an "Over The Air" SMS that has an incorrect signature and then always recieves a response that he already kn

Sorry, I'm not a crypto guy. It seems that he sends an "Over The Air" SMS that has an incorrect signature and then always recieves a response that he already knows. EDIT: Ok, I just read your other comment and must say that you probably understand a million times more about this than me, so disregard this comment.