The Research On Some Key Issuesof Enterprise Instant Messaging Systembased On Mobile Terminal

Instant messaging function isfrequently used in the process of enterprise production activities.Instant messaging systems in LAN environment,can not well meet the actual demand in mobility.Instant messaging systems in mobile terminal,such as QQ and WeChat,which is designed for public users,it's function can not meet the enterprise personal needs very well.Mobile terminal enterprise instant messaging system is an important research direction in the field of real-time communication which has a strong research and application value.As an important carrier of information,images are used very frequently in the enterprise,and many of the images are involved in enterprise core business secrets,However,the network environment for mobile terminal is not safe,it is necessary to study the encryption and authentication of the image in the mobile terminal,to ensure its security in the transmission process of real-time messaging system.In this paper,the encryption and authentication of the image in the mobile terminal is firstly explored.On this basis,a mobile terminal enterprise instant messaging system is designed and realized.The results of this paper are as follows:(1)A new image encryption algorithm is proposed for the mobile terminal.The architecture of the algorithm is based on scrambling and diffusion,and the key stream is generated interatively using discrete skew tent map,scrambling and diffusion respectively using simple linear mapping and XOR to realize.The experimental results show that this algorithm is effective,and can effectively resist the exhaustive attack and statistical attack,when the encryption round number is less than 5,the speed performance is good,can be competent for the task of image encryption in mobile terminal.(2)An image authentication algorithm suitable for mobile terminal is proposed.The algorithm block the image and calculate it's entropy as the watermark information which embedded into the middle frequency region of the corresponding block DCT transform domain.The experimental results show that the watermark imperceptibility is good,and is robust to operations of keep content,the entropy of the image as the watermark informationreduces the complexity of the algorithm,the speed performance is good,at the same time as the blind watermarking algorithm,without original image when authenticate,reduces the pressure of data transmission in mobile terminal.(3)Design and implementation of a mobile terminal enterprise instant messaging system.On the basis of analyzing the function and non-function requirement of the system,the paper puts forward the solution to the enterprise organization structure management,communication content trace back and file transfer.The test shows that the system can effectively ensure the security of enterprise image data in the mobile terminal transmission process,and can effectively meet the needs ofenterprise organization structure management and communication content trace back.