An option that controls whether the database ID generated for each audit should be a pseudo-random number (a value of true) or sequential (a value of false).

Then a chaotic stream cipher based on the pseudo-random number generator is designed, which has high security, low cost and easy realization proved by some experiments.

It is difficult for an eavesdropper to extract information about chaotic systems for every bit of pseudo-random number generator is generated from three different chaotic orbits.