Abstract: Disclosed is a password authentication system and a password authentication method using continuous password authentication. In the password authentication system, a password is set using an original password and a shift value, and the password authentication system includes a password authentication unit configured to receive a password subjected to the shift value, apply the shift value inversely to the password to obtain the original password and perform authentication processing, a defense mode changing unit configured to change to a defense mode requiring continuous authentication of the password at least twice, and a defense mode control unit configured to require the user to continuously input a first password and a second password, and to determine the authentication of the password as a success and release the defense mode.

Abstract: A password input device comprises a storage unit for storing character strings according to each icon; an input window generation unit for generating and displaying an input window on which a plurality of icons are arranged; a secret icon recognition unit which confirms a shift coordinate value and recognizes icons, which are arranged on coordinates inversely moved up to the shift coordinate value from a coordinate value at which a selected icon is arranged, as secret icons selected by the user if the user selects the icon; and an authentication processing unit which confirms a character string corresponding to each secret icon recognized in the secret icon recognition unit, generates a combined character string in which the one or more confirmed character strings are arranged, and authenticates the user by confirming whether the generated combined character string is consistent with the user's password stored in the storage unit.

Abstract: Disclosed is an icon password setting apparatus and an icon password setting method, which provide a keyword of an icon for an icon password to be set. The icon password setting apparatus according to the present invention enables password setting using an icon image and an associated keyword, the apparatus comprising: a password management unit for generating or inquiring an icon password; a keyword phrase management unit for generating or inquiring a keyword phrase of the icon password; a password list generating unit for generating a list having each icon password and corresponding keyword phrases; and a user password setting unit for receiving a request for setting the password for the icon password in the list and setting a user password. According to the present invention, a user may easily remember an icon password using the keyword phrase provided when setting the icon password.

Abstract: The present invention relates to a passcode operating system, to a passcode apparatus, and to a super-passcode generating method, which are capable of protecting user authentication information from external hacking. The passcode apparatus of the present invention comprises: one or more processors; a memory; and one or more programs stored in the memory and configured to be executed by the one or more processors. The program includes: a data safekeeping module for storing user-specific passcode data; an input window module for displaying an input window on which multiple icons are arranged; and a passcode-generating module for checking, when icons are selected through the input window module, the character string corresponding to each selected icon on a virtual keyboard contained in the passcode data, generating a seed passcode in which the checked character strings are combined, and generating a super-passcode for each website using the seed passcode and a site code.

Abstract: Disclosed are a device and a method to display a fingerboard of a mobile vibration guitar in a mobile device, such as a cellular phone. A mobile device screen, such as a cellular phone screen, is too small to display a long fingerboard without causing difficulties when playing. The present invention is provided to display a whole fingerboard within a small screen of a mobile device without any difficulties when playing. A player may play the mobile virtual guitar by applying various playing techniques used to play the real guitar. The fingerboard is directly played with fingers on a mobile screen that is a touch screen supporting a multi-touch operation. Since a movement recognition sensor is attached inside the mobile device, and the fingerboard on the screen is synchronized with the longitudinal movement of the fingers, the fingerboard may move in the same direction and at the same speed as the movement of the fingers.

Abstract: The present invention is proposed to solve the problem of high cost of an ordinary OTP token and the problem of vulnerability to hacking of a mobile OTP, for which an OTP program is mounted to solve the problem of high cost. There is provided a user authentication system and a method thereof, in which a user sets an image password as a fixed key, a query terminal outputs a query screen on which a created OTP is divided into pieces and matched to images of the fixed key, the user who confirms the query screen sequentially inputs the numbers that correspond to the image password, i.e., the fixed key of the user himself or herself, and a result of user authentication is processed according to whether the inputted numbers are matched to the response value prepared in a server.