IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY - TRANSACTIONS OF ELECTRICAL ENGINEERING, cilt.1, sa.1, ss.1-12, 2022 (SCI-Expanded)
Today,
the use of these methods as hybrids has provided the motivation to be a
solution to important problems, since the existing methods are insufficient at
some points in ensuring the security of personal data. In data security, the
inability to decrypt and decrypt the signal to be encrypted retrospectively has
always been the subject of research in terms of privacy. At this point, it was
preferred to use the electrocardiography (ECG) signal, which is a signal that
shows the vital signs of the human body and is also difficult to copy. In the
study, firstly, the emulator circuit was obtained by using the mathematical
model of the ECG signal. With this obtained signal, the audio signals are
masked. The audio signal masked on the transmitter side and the signals
providing synchronization were transmitted to the receiver side over a single
channel using the frequency division multiplexing (FDM) method. Then, the
sliding mode control (SMC) method was chosen for the synchronization of the ECG
emulator circuits on the receiver and transmitter side. Histogram, spectral,
mean square error (MSE), peak signal to noise ratio (PSNR), key space and key
sensitivity, NSCR (number of
sample change rate),
UACI (unified average changing intensity) and PESQ (perceptual evaluation of speech quality) analyzes were used to check the
accuracy of the system. These analyzes showed that the ECG encoding method has
faster unit change, reduces synchronization time, minimizes losses and improves
the security of the masked signal compared to other methods sent from two
channels. Finally, use of an arrhythmia ECG signal for the synchronization
signal on both the transmitter and receiver sides, the synchronization of this
signal with the SMC method and the testing of a live audio recording in
addition to the conversation, distinguishes the study from other existing
studies and reveals its originality.