This document describes a code modulation based encryption and decryption technique for secure wireless communication. The system has a transmitter section and receiver section, each designed around a microcontroller. At the transmitter, data typed into a PC is encrypted using the microcontroller and transmitted via RF. At the receiver, the encrypted data is received, decoded by the microcontroller, and displayed on the PC. To view the actual data, a password must be entered which decrypts the cipher text into plaintext. The block diagram shows the transmitter components include an encoder, microcontroller, MAX232, and RF transmitter. The receiver components include a decoder, microcontroller, MAX232, and RF receiver.
