Abstract: With the development of information technology, enterprises\' awareness of security has undergone tremendous changes. Core confidential data is stored in computers in electronic form. Once leaked, it will bring a fatal blow to the enterprise. Therefore, information security construction has become an important task facing enterprises. The File Non-Proliferation System (FNS) came into being, which can effectively protect important electronic documents of enterprises. This paper encrypts USB interface data through the file filter driver to ensure the security of USB interface data. FNS realizes the dynamic update of encryption algorithm, making the system more scalable.
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