Abstract
This thesis partitions mainly into two parts, one is the encryption/decryption of the data packet to be communicated and the other is the wireless transmission interface. The format of the wireless data packet generated by the 2.4 GHz UBEC UZ2400 transceiver module is IEEE 802.15.4-compliant. The data packet comprises the following various fields: preamble, start of frame, frame length, frame control, sequence number, addressing information, payload data, and frame check sequence (FCS). For the data encryption/decryption, the Advanced Encryption Standard (AES) algorithm is investigated and applied to enhance the security of the wireless communications undertaken. The AES algorithm is entirely based on finite field arithmetic and very structured accordingly. AES has been studied, analyzed, and discussed in detail. Moreover, the Microchip PIC16LF877A microcontroller and its 35 PIC16 assembly language instructions are utilized to implement AES to achieve enhanced security for the digital wireless transmission/reception over the open space. As to the wireless interface, the configuration registers of the RF transceiver modules are properly set through the 4-wire serial peripheral interfaces (SPI) by microcontrollers to ensure proper functioning of the entire digital RF transceiving system. Lastly, the communication reliability and range are tested in various open sites.
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