Dealing with an active intereferer in secret-key agreement

I gave a talk at the 3rd Rutgers-Helsinki PhD student workshop today and got some useful feedback from Marco Gruteser. He came up with the following attack: What is Eve transmits a oulse signal that momentarily causes the received signal at Alice as well as Bob to go above the threshold level q_+ ? This would allow Eve a way of forcing Alice and Bob to generate certain bits at certain instants of time. How can this be avoided. There seems to be a mounting pile of active attacks that I need to address. Perhaps I should consider working on addressing ‘active attacks in secret key agreement’. Some of the active attacks are clearly protocol-specific (Ee inserts a message of some sort that appears in the prorcol) and some are purely at the physical layer – of the type suggested by Marco for example. IT would be intresting to study what is possible and whayt is impossible from the point of view of an adversary messing things up.