Algorithm 3:

Require: 1 × 9 VRF signal array, $x\left[1\dots 9\right]$. Let the number of adjacent points $m$. Select the $m/2$ number of neighbor points for each signal point $c$ with respect to front and back. Calculate the difference between consecutive points. Comparison of the result is computed as, $x\left[i\right] \le x\left[i+1\right]$, where 1 in case of current element greater than or equal to the adjacent value, else 0. In the encrypting step, the binary value is converted into a decimal value.