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Article

Robust Intra-Body Communication Using SHA1-CRC Inversion-Based Protection and Error Correction for Securing Electronic Authentication

by 1,2 and 1,3,*
1
School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Korea
2
LG Display Co., Ltd., Gumi 39394, Korea
3
School of Electronics Engineering, Kyungpook National University, Daegu 41566, Korea
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(21), 6056; https://doi.org/10.3390/s20216056
Received: 12 September 2020 / Revised: 21 October 2020 / Accepted: 21 October 2020 / Published: 24 October 2020
(This article belongs to the Special Issue Internet of Things, Smart Sensing and Data Fusion in Smart City)
The explosive increase in the number of IoT devices requires various types of communication methods. This paper presents secure personal authentication using electrostatic coupling Intra-body communication (IBC) based on frequency shift keying (FSK) and error correction. The proposed architecture uses GPIO for a transmitter and analog-to-digital conversion (ADC) for a receiver. We mplemented FSK modulation, demodulation, data protection, and error correction techniques in the MCU software without applying hardware devices. We used the characteristic that the carrier signal is 50% duty square wave for 1-bit error correction and applied a method of randomly inverting SHA1 hash data to protect user authentication data during transmission. The transmitter modulates binary data using a square wave as a carrier signal and transmits data through the human body. The receiver demodulates the signal using ADC and decrypts the demodulated binary data. To determine the carrier frequency from ADC results, we applied a zero-crossing algorithm which is used to detect edge characteristics in image processing. When calculating the threshold value within the zero-crossing algorithm, we implemented an adaptive threshold setting technique utilizing Otsu’s binarization technique. We found that the size of the electrode pad does not affect the signal strength, but the distance between the electrode pad and the skin has a significant effect on the signal strength. Our results show that binary data modulated with a square wave can be successfully transmitted through the human body, and, when 1-bit error correction is applied, the byte error rate on the receiver side is improved around 3.5% compared to not applying it. View Full-Text
Keywords: intra-body communication; electrostatic coupling; error correction; securing electronic authentication; secure hash algorithm 1 intra-body communication; electrostatic coupling; error correction; securing electronic authentication; secure hash algorithm 1
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MDPI and ACS Style

Cho, S.; Park, D. Robust Intra-Body Communication Using SHA1-CRC Inversion-Based Protection and Error Correction for Securing Electronic Authentication. Sensors 2020, 20, 6056. https://doi.org/10.3390/s20216056

AMA Style

Cho S, Park D. Robust Intra-Body Communication Using SHA1-CRC Inversion-Based Protection and Error Correction for Securing Electronic Authentication. Sensors. 2020; 20(21):6056. https://doi.org/10.3390/s20216056

Chicago/Turabian Style

Cho, Seongho, and Daejin Park. 2020. "Robust Intra-Body Communication Using SHA1-CRC Inversion-Based Protection and Error Correction for Securing Electronic Authentication" Sensors 20, no. 21: 6056. https://doi.org/10.3390/s20216056

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