Circuit model for mode conversion in coplanar waveguide asymmetric shunt impedances - Electronics Letters

Eve is active, we need to determine the upper bound on the probability of the event that Alice and Bob do not both reject although secret-key agreement has not been successful. There are two cases in which this can occur: one is where Eve successfully guesses a = &(S) to impersonate Bob and makes Alice accept. The other case is where, after Eve saw&(S), she successfully guesses c = f,(S) to impersonate Alice, and makes Bob accept. In the first case, Eve knows U = U , and Hz(q U = U ) 2 tn, so the probability that Eve successfully guesses a = &(S) is upperbounded by