3.This article studied and has realized in the symmetrical passwordsystem DES algorithm, the male key passwordsystem RSA algorithm with emphasis and uses in the digital signature MD5. algorithm, has made the secure analysis.
4.These accesses are protected by a passwordsystem or data encryption which keeps out unauthorized users by requiring users to enter a code before being able to access the computer.
6.The main content and results of study involved in this dissertation are divided into four parts:Firstly, we establish a Chinese password recognition system based on CDHMM and research into the training problem of HMM parameters.
