Research And Actualization Of The Technology Of Data Isolation And Data Encryption

In this thesis we genally describe the developing process of the technology of physical isolation and data encryption. After deeply studying all kinds of problems of current actualization methods, we put forward to a new actualization method of the technology of physical isolation on the base of CPLD. We make a lot of research on data encryption and describe the design method of the encryption chip on the base of LFSR (linear feedback shift register). After putting forward to the whole design procedure, we design an encryption chip on the base of LFSR, which can provide the high-quantity data stream of encrtption. Through testing the testing board, we conclude that the new actualization method has such advantages as setting randomly the capacity of a hard disk, translating the working disk conveniently and so on. By the mock test of the encryption chip, we make a conclusion that the encryption data stream which is generated by the chip has such advantages as good randomicity, good expandability in correspondence with change of password and SAC (strict avalanche criterion). That is to say, it can provide such a high-quantity data stream of encryption that we can improve the ability of data encryption.