Research Of Security File Transfer System Base On SSL And Linux Environment

With the rising growth of the Internet in China, network environment is becomingincreasingly complex. As one of the early protocol of the Internet, FTP (file transfer protocol) isstill widely used on all occasions of today’s Internet. Therefore, the research of security filetransfer system becomes more important than ever.Based on a detailed analysis of file transmission system research background, this paperfirst discusses major threats of Linux environment, and the characteristics of the SSLprotocol.Second,detailed discusses the important of the encryption algorithm from design andimplementation. And then design and implementation of a security file transfer system base onLinux environment, and then Analysis the system framework, The implementation details andvarious modules. The system by introducing a security socket layer protocol (Security SocketLayer, SSL) of, and will FTP data in the preliminary processed by SSL encryption processing,and then upload, transmission, download and display. This paper’s mainly work and achievementinclude:1. With the threats from Linux environment, this paper explains the necessity of security filetransfer system, and explain the concept of SSL protocol, and the realization process of SSLprotocol, SSL protocol advantages, and introduced the famous OpenSSL library.2. Analysis of the famous symmetrical encryption algorithm and asymmetric encryptionalgorithm and the encryption algorithm, with the famous openssl, expounds various encryptionalgorithm that SSL used, explain all kinds of data structure in detail, provide possible convenientto the following researchers.3. According to the actual need of the FTP security, using SSL protocol and all kinds ofencryption algorithm to strengthen the security of the FTP. Developing the security file transfersystem code in C language. This system can accomplish file transfer functions of the system，andData transmission is encrypted transmission. Finally, we carried out a detailed software testing to this systemThis paper design and implement a security file transfer system based on SSL in theapplication layer. It is actually proposed an improved file transfer system method in Linuxenvironment, that is introduce SSL protocol to strengthen the security of the traditional filetransfer system, to provide valuable exploration for the data transmission security in Linuxenvironment.