DESIGN AND IMPLEMENTATION OF TRANSCEIVER SYSTEM FOR UNDERWATER QUANTUM KEY DISTRIBUTION (QKD) USING LED AND LORA

• Main Author: Zaidan Nabhan, Naufal
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/84534
• Institution: Institut Teknologi Bandung

The development of underwater communication systems is crucial for various activities such as offshore surveys, navigation, as well as defense and security operations. These systems hold great potential, but they also raise concerns about the interception of transmitted information. Therefore, encryption is essential to ensure that only authenticated recipients can access the data. Traditional cryptographic techniques face challenges from increasingly advanced quantum computers, which can break encryption more quickly. Quantum Key Distribution (QKD) offers a secure communication method by utilizing the principles of quantum mechanics for key distribution, making it resistant to eavesdropping. This research aims to implement an underwater QKD transceiver system using optical transmission for the quantum channel and radio transmission for the classical channel in an Underwater Wireless Sensor Network (UWSN) for short-range communication up to 90 cm. Testing was conducted on both channels, i.e., the quantum and classical channels. The results showed that in the quantum channel transmission, the shortest pulse duration successfully received was 380 ns with a Signal-to-Noise Ratio (SNR) value of 2.18 dB. The classical channel measurements showed a Received Signal Strength Indicator (RSSI) of –41.75 dBm and an SNR of 28.25 dB for LoRa signal reception. The test results of the quantum and classical channels at each distance were plotted and compared with theoretical models to evaluate the performance of both channels.