Encryption for low data rate systems is actually a very easy problem. I have sensors in the field which transmit a 64 byte package once a day only 18 bytes of w

Encryption for low data rate systems is actually a very easy problem. I have sensors in the field which transmit a 64 byte package once a day only 18 bytes of which is data and is encrypted. the encryption an one time pad in ROM which lasts the life of the device (8 years) the device does not receive. I agree encryption is totally necessary for medical/sensitive data or two way devices but for other cases (such as irrigation data) no encryption or an encrypted ID is just fine and a problem that does not need to be solved.