The world's first artificial satellite was launched by the Soviet Union in 1957. Since then many more satellites have been launched. Many of them still in orbit around the earth. Some still functional but unused. Some still fully operational.
Considering that the first publication of the draft for the Data Encryption Standard was in 1975, and that encryption methods used before that time were certainly much less secure from a mathematical point of view, my question is: How is the communication between a earth transceiver station and an artificial satellite encrypted / verified? (In old satellites). How did they make sure that no one else would just send some commands to the satellite and "hijack" it? I assume modern day satellites use more advanced encryption methods. Is this the case?
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