Implementing and developing secure low-cost long-range system using speech signal processing

Abstract

In the proposed work, we present a secure low-cost speech communication system for long-distance communication. The system utilizes long range (LoRa) technology to transmit speech signals. LoRa technology uses spread-spectrum modulation to enable long-range communication with low power consumption. LoRa modulation allows for data transfer at a slow speed, typically below 22 kbps, which makes it infeasible for transmitting speech. To address this limitation, we suggest a speech coding technique that reduces the overall data rate of speech signals to below 7.5 kbps. This lower rate is more compatible with the LoRa module and ideal for transmitting speech. Moreover, this technique can improve the LoRa transmission range. Additionally, we have developed an encryption-decryption method to ensure the privacy of the messages and prevent unauthorized access by third parties.

Implementing and developing multi-stage cryptography technique for low-cost long-range communication system

“…Cryptography involves two primary processes: encryption and decryption. Encryption is the process of converting plaintext into ciphertext, while decryption is the opposite process of converting ciphertext back to plaintext [14], [15], [17]. To decrypt the message and access the original content, a secret key or password is required.…”

Long range based effective field monitoring system

“…However, there are several restrictions on LoRa's data transfer rate. LoRa's bit rate is lower than Wi-Fi's, which ranges from 20 to 30 Kbps [28]. Table 1 compares the most common communication protocols in use today.…”