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Answer
Neither the RM024 nor the LT11110 modules have support for encryption. For security these modules offer the following:
1. Proprietary protocol - the RM024 uses a proprietary protocol which will only communicate with other modules using the same proprietary protocol.
2. System ID - Unique system ID, similar to a password character or network number which makes eavesdropping more difficult. A receiving transceiver will not go in range of or communicate with another transceiver on a different System ID.
3. RF Channelization - The radio uses FHSS (Frequency Hopping Spread Spectrum) protocol in which the transceiver communicates using frequency bins spaced throughout the frequency band. The RF channel specifies the unique pseudo-random hopping sequence which will be used by the radios in the same system/network. This also makes eavesdropping more difficult.
4. (Optional) Vendor ID: The Vendor ID, like the System ID, can be used to uniquely identify a network. Radios with the Vendor ID set, only communicate with other radios with the same set Vendor ID. The Vendor ID is a protected EEPROM parameter, and its value cannot be read. It can only be written once. OEMs should be aware that improperly setting the Vendor ID can cause communication issues. Setting the Vendor ID to an unknown value effectively renders the radio unable to communicate in a network.