Abstract
WirelessHART (Wireless Highway Addressable Remote Transducer) is a secured mesh networking technology based on Time Division Multiple Access (TDMA). The operating speed of a WirelessHART network is 2.4 GHz. The specifications in the WirelessHART have been organized well, but security standards are loosely defined. In order to design a standard security system we incorporate automatic key management system which generates various keys to shield the data-link layer. The primary goal of the project is to design a decryption function that receives the transmitted data in the network and decrypts it to the device usable format using the AES algorithm designed in Verilog. Decryption is done to compliment the encryption process; this gives us back the original data. The project report includes mesh security aspects, keying for security system design, network threats, Verilog coding and simulation of the design.