<p>➀ This article introduces an IoT Security System leveraging AES (Advanced Encryption Standard) to protect sensitive data from unauthorized access, focusing on AES-256 encryption and decryption.</p><p>➁ It provides a detailed explanation of how AES works, including key expansion, SubBytes, ShiftRows, MixColumns, and AddRoundKey processes.</p><p>➂ The project includes both a standalone AES-256 encryption demo and an IoT sender-receiver system with a web UI for encrypted data transmission, demonstrating practical implementation of AES in IoT applications.</p>