"단기 OTP" is a mobile application developed by ST Unitas, available for Android users. It is a free app that provides an additional layer of security to protect learning contents from illegal sharing. The app requires a second authentication when users change the device they are using to access the content. This ensures that only authorized users can access the content, even if they have shared their login credentials with others.

The app generates an OTP (One-Time Password) authentication number every 30 seconds, which is valid for a short period. The OTP authentication number is required to access the learning content, and it is automatically updated every 30 seconds. Users can install the app on only one device per Connects account. The installation process requires a one-time login for authentication.

The app does not require any mandatory access permissions. However, users can choose to allow access to their phone's call feature for self-authentication purposes. This is an optional feature, and users can choose not to grant this permission without affecting the app's functionality.

Overall, "단기 OTP" is a useful app for students who want to protect their learning content from unauthorized access. It is easy to install and use, and the automatic OTP generation makes the authentication process seamless.