jsc2022e087162 (11/16/2022) --- For Secure Laser Communications between International Space Station and Ground Station (SeCRETS) investigation, the cryptographic keys (random numbers) sent from the transmitter are sent in the free space optical communication path and received by the detector installed on the ground. In this key sharing, the information exchange of error correction and key distillation via the International Space Station Radio Frequency lines. Image courtesy of JAXA.