USER DEVICE PERFORMING PASSWROD BASED AUTHENTICATION AND PASSWORD Registration AND AUTHENTICATION METHOD THEREOF

Password registration method of the user apparatus using a password-based authentication method according to the present invention, performing the expansion operation for the step of adding a salt to the entered password generating a combination password, the combination of the password and the data length of extension and a step of generating the extension password, generating the authentication information by compressing the extended password, and a step of storing the authentication information in the authentication database.