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Secure Data Transceiver

This is a micro-controller designed to encode and hide transmitted number data being sent and received by a radio system. It serves as an intermediate system between the antenna and a data handling radio system. What the system does is take a number being sent to another location and breaks it down into individual digits. It has been modified to be able to successfully handle negative numbers by using a second encryption system for any 6 digit numbers less than 0. It then takes those digits and replaces them with other digits from a table of values. It then combines the substituted numbers back into a larger number and sends the encoded number to the antenna to be transmitted. The system also takes the coded number received by the antenna, decodes it using a compatible table, and then sends it to the radio system as a translated number. The system can encode up to 6 digit numbers on the first 10 composite channels for the frequency of the parent radio system. It uses a very simplified substitution cipher to mask transmitted number data and make it very hard to intercept and use the data against you. I made this system to safely transmit information between vehicles that would look like nonsense to someone not using a properly coded radio system. There are 10 key settings with setting 0 being un-encrypted and 1 through 9 using different tables to substitute the individual digits. To demonstrate how to use the system, I paired it with my IFF Transponder system because it sends and receives 4 different sets of number data. I also regularly pair it with both radio systems that are part of my Integrated Navigation System. With that system, I use two of these modules, one for the IFF System and one for the TACAN System. This way, both systems can have their data encrypted.

What you will need:

- A radio based system that transmits number data up to 6 digits
- A transmitting and receiving antenna
- 1 Instrument Panel:
- - 1: Up Arrow Push Button ( _ Key Up)
- - 2: Seven Segment ( _ Key)
- - 3: Down Arrow Push Button ( _ Key Down)
- - 4: Indicator ( _ Key Active)
- - * The "_" indicates the name or identifier of the parent system in case you use multiple systems or instances of this encryption system
- 1 2x3 Micro-controller
- - I recommend placing it near the system you want to encrypt to simplify installation
- Another vehicle with this system installed

You setup the system by connecting the instrument panel to the two composite nodes for the control panel on the controller. The incoming data to be encrypted node is connected to the transmitted data node of the parent radio. The encoded data node is connected to the transmitting antenna. The received data node is connected to the receiving antenna. Finally, the decoded data is connected to the received data node of the parent radio. I always color the "Secure" systems blue so they stand out next to all of my other systems.

The system uses the same key setting to encode and decode data, so if you have the system enabled it can only receive encoded numbers. It will attempt to decode all data that it receives making un-encrypted data completely worthless.