Research And Implementation Of File Secrecy System Based On USBkey

Information privacy protection,integrity checking in network transmission,anti repudiation and controllability of information release are important contents of the information security research.In view of the actual application requirements of an enterprise,this paper aims to realize a tool of high availability,high controllability,identity authentication and file privacy protection.This paper firstly summarizes and analyzes the advantages and disadvantages of various file encryption techniques proposed by domestic and foreign scholars,then researches the authentication,key management mechanism of USBkey,the basic principle of symmetric encryption algorithm,asymmetric encryption,hash algorithm and digital certificate,finally designs and implements a file secrecy system based on USBkey.The file secrecy system is mainly divided into 4 modules:login,encryption,decryption and the certificate management.The login module implements authentication by detecting the USBkey and checking the PIN code entered;the encryption module is to complete file encryption.We use a random key to encrypt file with symmetric encryption algorithm,use the public key to encrypt the random key with asymmetric encryption algorithm,and use the hash algorithm to deal with the hardware code,password,then we calculate the MD5 value of the file;the decryption module is to complete the reverse process of encryption and obtain the clear text;the certificate management module is to add,modify and delete the certificates.Compared with the existing encryption software,the system has obvious advantages in file encryption speed,ease of use,stability and compatibility.In addition,in order to ensure the security of the file,this article especially introduces a secure platform to achieve the reliable transmission of the file.Through this system the ciphertext can't be read directly,the certificate can't be forged and hardware code can't be copied,all of them ensure the safe storage of important documents,the security of internal information,at the same time,it has beautiful interface and simple operation.In a word,this system has strong promotional value.