KEELOQ® is an authentication system designed by Microchip. It’s based on a proprietary, non-linear encryption algorithm that creates a unique transmission on every use, supposedly rendering RF replay attacks useless. The algorithm uses a programmable 64-bit encryption key unique to each device to generate 32-bit hopping code.
In this new app note, Microchip presents a design for a basis wireless home security system. The project implements an HCS200 encoder for the intruder sensor signal encryption, one PIC12C508A PIC® MCU for sensor monitoring and RF signal initiation, HCS515 decoders for decrypting the received intruder sensor signal and a PIC16C77 PIC MCU for base station panel monitoring and control.
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it would be really great to see this implemented into a home security system like the one found at http://www.simplisafe.com.