Research And Application Of Covert File Transmission Based On Intelligent Terminal

With the rapid development of information technology,mobile communication devices have advanced into intelligence and multi-functionalization.As the dominant intelligent mobile terminal,Android operating system has also achieved rapid development.Due to the improvement of hardware performance and storage capacity of intelligent terminal devices,it becomes more and more convenient for data exchange and sharing through mobile terminals,on the other hands,ensure the security of mobile information in the data era is becoming more and more important.For the problem of security concealment of wireless file transfer between mobile devices in this article,we studies from the wireless link layer and the transport layer.The link connection adopts the mainstream Wi-Fi technology,After analyzing and researching it,based on the original link authentication and access authentication,an identity authentication scheme is proposed through the device physical information,thereby enhancing the Wi-Fi group.For the security of the network,when the hotspot is established,the service set identifier is not broadcasted externally,the password and name of the hotspot are generated dynamically,and the credit device can be automatically connected to achieve relative concealment of the networking.On the transport layer,we analyzed the asymmetric encryption algorithm and the symmetric encryption algorithm.Combining the advantages of the two algorithms,a double encryption algorithm design scheme is proposed to ensure the security in the data transmission process.We research on the covert channel and propose the TCP packet-based covert channel design scheme,the covert channel is used to pass the RSA encryption algorithm to encrypt the secret information of the DES key,so as to realize the concealment of the information transmission process.Finally,bsaed on the above research,the overall structure design of the hidden file transmission system is proposed,and the development of the application system is implemented in the smart-end Android system.In order to meet the needs of special occasions,point-to-point file transfer can be realized in a non-contact and unperceivable manner,and the transmission process can be controlled by one button,which guaranteed the security of data in the transmission process.The application software is based on the software and hardware capabilities of current mobile intelligent terminals,and builds short-distance file transfer systems that can automatically complete the establishment of network networking,automate the identification and authentication between specific devices,and establish covert channels for the transfer of secret information.The use of FTP protocol for multi-file transmission,and complete the file data encryption.After the file is transmitted,the system can destroy the information of the WIFI network configuration,delete the sent file,and avoid information forensics.