The signal on this one is similar to this Transmiter http://www.ebay.com/itm/Hot-433MHZ-Wire ... 1c37240442
(this link is not my product).
It's ASK Transmitter module. The receiver producs are available on ebay. If I encoded the signal, then it won't work; however,
if customer want me to do freelance work for more secured system, I can implement it by using 4 Channels Receiver with one Relay and 3 AND gates (triad maybe) two transmitter modules on Raspberry PI to send signal out. One transmitter to scramble and other to send out message. On the Receivers side is 4 Channels to control one relay. If you know how these transmitter and receiver work, you will know the number of possibilities that can't be hack in. I can make this system is about 99.99 percent unhackable signal. But in the mean time for general audiences and general receivers available on the market, I made it this way.
Thank you for your output