The Design Of Big File Safety Transmission System Under The Public Network Environment

With the rapidly development of computer technology, software system in the application of computer field becomes more and more widely. In the file transfer system, especially in large file transfer there are some disadvantages. By using multithreading technology, improve the response of the server and concurrent processing power ability and reduce the network transmission burden. The user can choose the breakpoint continuingly or upload again. The user can upload more files through the big file transfer system. Big file transfer system provides comprehensive interface. It can dynamically setting upload save the path and allows setting transmission file extensions and size, etc. In order to guarantee the transmission to the file in the network security transmission, need to have a highly efficient and fast data encryption transmission system.Based on the network data encryption transmission problem is an important issue in the field of information security of one. This paper firstly introduces the network information safety situation and network security of threat. In order to ensure the safety in the process of information is transmitted by the information encryption technology, analyses the data encryption algorithm of some principle, introduces various common password technology, including symmetrical encryption algorithm DES, public key encryption algorithm RSA, message digest and digital signature. They guaranteed the data integrity. The above theory foundation, this paper analyzes the feasibility of big file transfer system. To the server respectively application and the client applications function modules and functions security demand analysis are introduced. In this foundation presented a hybrid encryption algorithm model, and detailed analysis of the encryption transmission system solutions use of symmetrical encryption algorithm asymmetric decryption algorithm and the function to a can realize rapid transmission and fast encryption has the function of digital signature based on big file transfers data encryption transmission model. Ensure the rapid transmission of data files, the feasibility and the integrity of the data.