Method of performing one-time password (OTP) authentication using color code and OTP authentication server using color code

A one-time password (OTP) authentication server, comprising:

• an OTP generation hardware processor configured to generate an OTP according to a reference time;
• a communication module hardware processor configured to receive an image generated by capturing a display screen on which a color code is displayed;
• a storage device configured to store a code table;
• a central processing unit (CPU) configured to
• detect, for each pixel included in a cell of the image, a Hue Saturation Value (HSV),
• recognize a color being present in a maximum number of pixels in each of cells based on the detected HSV,
• extract the color code from the image based on the recognized color,
• convert the color code into a series of binary codes using the code table, and
• determine that a user is authenticated, in response to detecting that a match between the generated OTP and a password represented by the color code,
• wherein, in response to the determination that the user is authenticated, the OTP authentication server approves a transaction at an ATM machine, approves a credit card transaction, or sends a signal to open or close a door of the ATM machine,
• wherein a color scheme of the color code changes, in response to the reference time elapsing, and
• wherein the color code is generated by adding a dummy color at a specific position of the color code based on the reference time, and the CPU decodes the generated color code into the binary code by considering the dummy color added at the specific position of the color code according to the reference time.

A one-time password (OTP) terminal, comprising:

• one or more hardware processors configured to:
• generate, along with an authentication server, an OTP using a reference time;
• generate a color code corresponding to a binary code representing the OTP;
• change a color scheme of the color code, in response to the reference time elapsing;
• and
• obtain, from a camera, a color code displayed on a display device,
• wherein the authentication server determines that a user is authenticated, in response to detecting a match between the generated OTP and a password represented by the color code,
• wherein in response to the determination that the user is authenticated, a transaction at an ATM machine is approved, a credit card transaction is approved, or a signal is sent to open or close a door of the ATM machine, and
• wherein the color code is generated by adding a dummy color at a specific position of the color code based on the reference time, and the authentication server decodes the generated color code into the binary code by considering the dummy color added at the specific position of the color code according to the reference time.