Encrypting telemetry data

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”