Pattern input apparatus and method, and recording medium using the same

A pattern input apparatus for user authentication of a device, the apparatus comprising:

• a processor;
• and
• a non-transitory computer readable medium having computer executable instructions stored thereon which, when executed by the processor, performs the following method;
• providing, using a manipulation interface unit, a virtual manipulation interface to a user to input a pattern on a screen of the device;
• and
• providing, using a pattern lock interface unit, a pattern lock interface which is displayed on the screen of the device or hidden from the screen separately from the virtual manipulation interface and provides information on the pattern which is input through the virtual manipulation interface to the user,
• wherein the manipulation interface unit provides the virtual manipulation interface to the user after receiving an input to select a point on the screen of the device by the user, the virtual manipulation interface being generated in a region including the selected point, the selected point being any one node of the pattern lock interface,
• wherein, when a session related with the receiving of the pattern ends, the manipulation interface unit provides an additional input interface which demands additional input to delete a trace of a pattern which is input through the virtual manipulation interface,
• wherein the additional input interface is provided to the user so as to be included in a predetermined percentage or higher of the region where the virtual manipulation interface is provided, and
• wherein the pattern lock interface unit provides a part of information on the pattern which is input through the virtual manipulation interface to the screen of the device.