How to encrypt the telemetry data form jamming data my mode change when it comes near the communication towers
You probably do not want encryption. You want CRC or other error correction algorithm.
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How can I make crc algorithm
You do not need to make one, you can just activate CRC or ECC on the telemetry modules.
What telemetry modules are you using?
Digi xbee 9xtend from digi international company
Read the manual and search for “error correction”