Block diagram and C code for encryption and decryption using microcontroller at89c51

encryption and decryption using microcontroller at89c51

In every wireless communication, data security is the main concern. There are many ways to provide security to the wireless information from hackers. This project is mainly designed to provide security for data communication by designing standard encryption and decryption algorithms.
In this project, we use a 4×4 keypad to transmit the data to microcontroller of AT89C51 by pressing keys on keypad. Those keys are detected by microcontroller and the detected data needs to be encrypted. Here we use an encoder of HT640. It converts the data into secrete code for the purpose of security and sends to transmitter of STT-433. The transmitter transmits the encrypted data to destination through RF communication. The receiver of STR-433 receives it with 433MHz frequency and is decrypted by a decoder of HT649 according to an algorithm and displays decrypted data on 16×2LCD.