Each one-time password system allows users to log in using a different password. This system uses a device called a
password generator and an encryption program and the only internal encryption key words. System to the user when the
user logs on to provide a random number, the user password will be sent to the random number generator, user password
generator, key words on the random number encrypted, then the user password generator, then the output of the encrypted password into the system. System, the user input the password and it uses the same encryption key words and the random number generator of the password comparison, if both the same, allowing users to access the system. This method has the advantage of different users typing the password each time, so no password confidential and only need a password generator security. The system uses software as a pseudo-random number generator.