GÖKTÜRK-1 Satellite National Crypto Subsystem developed by TÜBİTAK BİLGEM is a system that provides secure transmission of commands to be sent from ground stations to the satellite and the high resolution image received from the satellite to ground stations.
The National Crypto Subsystem includes national crypto devices and associated key management and upload devices integrated into the satellite and ground stations. All developed devices have device level crypto analysis, COMSEC and TEMPEST approvals.
The GÖKTÜRK-1 Satellite National Crypto Subsystem has been in use since December 2016, when the GÖKTÜRK-1 Satellite was launched, thus making the crypto device integrated into the satellite the first national equipment to gain history in this field.