Hi all,
If you are not specific on data encription and decreption, there is a simple method for rf communication.
Just connect the datain pin of rf transmitter module to the tx pin of uart. Set the baud rate at 1200 kbps and send data. In receiver side you can connect the dataout pin of rf receiver to the rx pin of uart.
No need for encoder and decoder ICs unless you are using more than one transmitters or receivers.