  The measurement device independent (MDI) Quantum Key Distribution (QKD) is a
practically implementable method for transmitting secret keys between
respective partners performing quantum communication. SARG04
(Scarani-Ac\`{i}n-Ribordy-Gisin 2004) is a protocol tailored to struggle
against photon number splitting (PNS) attacks by eavesdroppers and its MDI-QKD
version is reviewed and optimized from secret key bitrate versus communication
distance point of view. We consider the effect of several important factors
such as error correction function, dark counting parameter and quantum
efficiency in order to achieve the largest key bitrate versus longest
communication distance.
