Electron Progress EAD (EPROGRESS) is a leading Bulgarian defense industry communications and information systems (CIS) integration company. It is the successor of the former Institute of Special Electronics (ISE), founded in the late 60s of 20th century. The company is a cutting-edge provider of C4I (command, control, communications, computers for intelligence) integrated solutions for Ministry of Defense, Ministry of Interior, Ministry of Transportation and Information Systems and other governmental and corporate organization’s needs. EPROGRESS has extensive experience and unique know-how in the development, design and implementation of communications and information products and systems. It has provided over the years CIS solutions based on the systems integration of ATM, ISDN, SDH, MPLS, VoIP, etc. technologies over fiber optics, wired, wireless and satellite communications media. The company has also received a patent in the field of improvised explosive devices (IED) counter measures. The company’s employs are highly skilled specialists in the area of CIS for national security and government purposes and almost all of them hold “Secret” level national security clearance and many of them have NATO “Secret” level security clearances. Currently EPROGRESS ensures the operation of the existing dedicated network in the Ministry of Defence of Bulgaria. Based on this and further having this specific clearance in the field of defence, the partner is selected to integrate the QKD layer in the existing network in the Ministry of Defence of Bulgaria.