As the encryption system is apt to be cracked by brute-force attack, a general encryption system model is established, which is immune from this attack and also can be used for text, voice or picture data encryption with keys of any length.

This paper studies asymmetric exhaustive service polling system with Bernoulli feedback,gives the distributions of queue lengths and sojoun times,and obtains some other results,in stationary condition.

The exhaustive service polling system with bulk arrival,and the distribution and mean of the queue length and the cycle time,service time and interval time of the server and the distributions of sojourn times are studied.

This paper studies exhaustive service polling system with bulk arrival and Bernoulli feedback,gives the distributions of sojourn times,and some other results in stationary condition.

With regard to certain discrete chaotic sequences,the step number of exhaustive history in production process is calculated firstly,then the percentage of each exhaustive comment is determined according to the length of the sequence,and exhaustive entropy of the discrete chaotic sequences is obtained.

In view of the influence of step size on the property and form of continuous chaotic attractors and simulation speed in simulation,the exhaustive process of chaotic sequence was analyzed,then exhaustive entropy of the sequence was computed and the chart of exhaustive entropy to simulation step size was plotted,finally the best range of simulation step size was obtained.

The doctrine “exploring thoroughly the logos and the intrinsic character to get the natural regulations” which once exerted a great influence in the history embodies the rich content.