Research And Implementation Of Internet Anonymous Transmission Channel Technology

The realization of safe and concealed information transmission in the Internet environment has been of great value.The traditional explicit communication based on VPN and content encryption is easy to be tracked,restricted,disrupted,cracked and exploited by attackers in an uncontrolled network environment due to the centralized target and obvious traffic characteristics.The existing anonymous transmission channel is difficult to take into account the requirements of low-cost,high-anonymity and high-performance.This thesis proposes an asynchronous transmission model that separates the control channel from the data channel.Based on the Internet File Sharing Service(IFSS),an anonymous transmission channel is constructed to achieve low-cost,high-performance,and high-anonymity secure transmission.The main contributions of the thesis include the following aspects:Proposing an anonymous transmission channel architecture based on IFSS.The anonymous transmission channel architecture adopts an asynchronous transmission model based on data-exchange file.Compared with the synchronous transmission model based on packet exchange in traditional TCP/IP networks,it has stronger anonymity and can effectively resist the tracking of network censors and malicious blocking.The anonymous transmission channel architecture includes control center,multiple IFSS repositories and exchange network.The transmission channel can be built on a variety of different types of IFSS,such as network disk,code hosting service,instant messaging software,e-mail,etc.,with good scalability.Proposing a multi-dimensional channel transmission protocol based on IFSS.Based on the anonymous transmission channel architecture proposed in this paper,a multidimensional channel transmission protocol based on IFSS is designed and implemented,and a data exchange file format with self-security protection capability is proposed,using a combination of asymmetric encryption and symmetric encryption.To ensure data security,the fragmentation mechanism is used to ensure the anonymity of both sides of the transmission,and the redundant transition mechanism is used to solve the problem that the data cannot be recovered due to the loss of some data fragments.The experimental results show that the multi-dimensional channel transmission protocol designed in this thesis has good usability and extensibility.Based on the network disk,code hosting service and an exchange network based on Syncthing,the thesis designs and implements an anonymous transmission channel,and completes the actual deployment and running tests in the Internet environment.The validity and engineering realization of the key technologies proposed in the thesis are verified.The research results of this thesis have good practical significance and theoretical reference value,and provide important support for the construction of a larger-scale Internet anonymous transmission system in the future.