One-time password (OTP, in Korean it is phonetically written as 오티피카드 for OTP card) is a device that generates single use passwords for internet or smartphone transactions. These devices provide an extra layer of security as their password can only be used once so your password cannot get stolen or copied. A new password is generated every minute. You can estimate how long it will take for a new password to be generated through the time bar on the left. These devices can also replace the security cards mentioned on the previous page.

Two different types of OTP are shown below and it is worth noting they are from the same bank, Woori. The left style is a keychain version and car keys are attached just out of frame, and the right is a credit card sized card which can be placed in a wallet. The thickness is the same except for the button, screen, and battery, which make it slightly thicker at those spots than a standard credit card.