Research And Design For USB And Network Cards Encryption Interface Card

In the network area,LAN,which people can not work without,has being an important work environment.It should be paid enough attention and research that how to ensure information security for a local area network.Therefore,this thesis conducted studies of computer network card and USB interface transmission in the perspective of protecting the security of information from being leaked easily on the local area network information security.Aiming at the problem,firstly,this thesis has study on the PCI card and mass storage device drivers under Linux,and encryption algorithms.After a detailed analysis of its working principle and source code,a design scheme of encrypted transmission encryption interface card for USB and network cards data is raised.In the network transmission side,the data on the data link layer of the Ethernet on the interface card can be automatic encryption and decryption: the data transmitted on the data link layer of the local area network can be automatic encryption,receiving is decrypted,achieving a transparent encryption and decryption of the upper layer transmission.So as to the USB data transmission,in the USB side,the data from or to the flash memory can be encrypted or decrypted automatically: after encrypting plaintext data from user space,the cipher text encrypted data is written to a USB storage device,when the user wants to read the USB storage device,the module will automatically decrypt to the user the cipher text data.Compared to existing solutions,what this thesis has proposed features comprehensive coverage,more thorough range of information encryption and ease to use.Finally,an interface card is designed,and corresponding driver on the PC is achieved too.Finally,the feasibility of the system design is verified through an experiment.At last,the expected goal of plan for the network and U-disk data encryption is achieved.