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

Seongho Cho^1,2, Daejin Park^1,3

¹School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Korea.

Sensors (Basel, Switzerland)

|October 29, 2020

Summary

This study introduces secure personal authentication using intra-body communication (IBC) with frequency shift keying (FSK) and error correction. The system successfully transmits data through the human body, improving receiver accuracy with 1-bit error correction.

Keywords:

electrostatic coupling error correction intra-body communication secure hash algorithm 1 securing electronic authentication

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Published on: July 26, 2013

Area of Science:

Biomedical Engineering
Signal Processing
Cybersecurity

Background:

The proliferation of Internet of Things (IoT) devices necessitates diverse and secure communication methods.
Intra-body communication (IBC) offers a promising avenue for secure personal authentication within the human body.

Purpose of the Study:

To develop and evaluate a secure personal authentication system using electrostatic coupling IBC.
To implement frequency shift keying (FSK) modulation, demodulation, and error correction techniques entirely in microcontroller (MCU) software.

Main Methods:

Utilized GPIO for transmission and Analog-to-Digital Conversion (ADC) for reception.
Implemented FSK modulation/demodulation, data protection (random SHA1 inversion), and 1-bit error correction in MCU software.
Employed a zero-crossing algorithm with adaptive thresholding (Otsu's method) for carrier frequency detection.

Main Results:

Successfully transmitted binary data modulated with a square wave through the human body.
Demonstrated that electrode pad size is less critical than electrode-skin distance for signal strength.
Achieved a ~3.5% improvement in byte error rate at the receiver with 1-bit error correction.

Conclusions:

The proposed IBC system provides a viable method for secure personal authentication.
Software-based implementation of FSK, error correction, and data protection is feasible and effective.
Optimizing electrode placement is crucial for robust IBC signal transmission.