Common Topic-Based Key Exchange Method for Encrypted Data Transmission in IoT Network

We propose a common Topic-based key exchange method for secure data transmission. In the recent years, with the development of artificial intelligence (AI) technology and the rapid increase of AI utilization in various fields, vast amounts of data have become necessary. Data collection using IoT devices is increasing, and in this process, data privacy and security issues are becoming an important challenge. However, existing methods require high computation, such as elliptic curve-based public key exchange methods. Therefore, we propose a simple key exchange method for encrypted data transmission in IoT environments. The proposed key exchange method ensures the security of keys by sharing common topics in advance and exchanging keys based on the topics. After that, the secured key is used to send and receive encrypted data to provide a secure channel. To confirm feasibility of the proposed method, we implemented the proposed method at the laboratory level using python scripts.