Implementation of Discrete Cosine Transform Method in Multi-Group Key Generation in Outdoor Environments

DOI

10.2991/978-94-6463-926-1_76How to use a DOI?

Keywords

Discrete Cosine Transform (DCT); Internet of Things (IoT); Key Generation; Received Signal Strength (RSS); Star Topology

Abstract

The rapid growth of Internet of Things (IoT) devices in outdoor environments raises critical concerns about secure key establishment. Conventional cryptographic methods often depend on pre-distributed keys or computationall intensive algorithms, which are unsuitable for resource-constrained IoT nodes. To address this challenge, this study proposes a physical layer key generation scheme that leverages Received Signal Strength (RSS) enhanced with the Dicrete Cosine Transform (DCT) under multi-group outdoor scenarios. In the proposed system, RSS samples are obtained through channel probing and standardized to 1318 iterations for fair comparison across nodes. The DCT is applied to emphasize dominant signal components while suppressing noise, and the resulting coefficients are converted into bitstreams using a lossy 2-bit quantization process. Bit mismatches are mitigated through BCH error correction with parameters (n, k, t) followed by privacy amplification using SHA-256 hashing. Experimental results show that the proposed method achieves a Key Generation Rate (KGR) of up to 96.2% and reduces the Key Disagreement Rate (KDR) to as low as 3.8% in outdoor multi-group scenarios. Compared to conventional RSS-based approaches, the integration of DCT improves the stability and correlation of generated keys. The novelty of this work lies in demonstrating DCT as a lightweight and effective pre-processing technique for RSS-based key generation, offering enhanced reliability and scalability for secure communication in IoT networks.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Marsya Sahila
AU  - Mike Yuliana
AU  - Amang Sudarsono
PY  - 2025
DA  - 2025/12/31
TI  - Implementation of Discrete Cosine Transform Method in Multi-Group Key Generation in Outdoor Environments
BT  - Proceedings of the International Conference on Applied Science and Technology on Engineering Science 2025 (iCAST-ES 2025)
PB  - Atlantis Press
SP  - 676
EP  - 686
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-926-1_76
DO  - 10.2991/978-94-6463-926-1_76
ID  - Sahila2025
ER  -