Algorithm 1 ECG-RNG.

1:procedurePreprocessing($EC{G}^{raw}$) 2:    DC elimination 3:    Bandpass filter ($[0.67-45Hz]$) 4:procedureWavelet decomposition($EC{G}^{cleaned}$) 5:    Split $EC{G}^{cleaned}$ into $ECG$-$windows$ (one heart-beat per window) 6:    for each ECG-window(j) do 7:        Discrete wavelet decomposition (set parameters L and $wf$) 8:procedureEntropy extraction(Wavelet coefficients of each $ECG$-$window$ (${\left\{c_i\right\}}_{i=1}^N$)) 9:    for each $c_i$ do 10:        Fractional part extraction ($z_i$) 11:        Output the 8-LBS bits ($ri$)