Study of the Data Exchanging Safely and Quickly for Sudden Leakage of Dangerous Chemicals Emergency Decision System Based on VPN

The sudden leakage of dangerous chemicals emergency decision system can help the government, chemical accident emergency rescue center, fire fighting and the units of production, transportation, storage or use for dangerous chemicals generate maneuverable emergency rescue plan in the shortest time according to the geographical location and the specific situation of the accident. The system owns the national urban dangerous chemicals database and provides the target quantity and the distribution of the urban dangerous chemicals. Because the data of this system belong to the state public security secrets, the data transmission must be safe and fast absolutely. VPN is a safe, special and virtual network which is temporarily established in the Internet. The system realizes the transmission and maintenance of the dangerous sources data, ensures the data safety and enhances the efficiency of data transmission through VPN.