Wearable device, system including the same, and operation methods thereof

A system comprising:

• an electronic device requiring user authentication;
• and
• a wearable device suitable for authenticating a user, detecting contact of the authenticated user thereto, and providing link success information to the electronic device during the contact after success of the authenticating of the user,
• wherein the electronic device is unlocked during the provision of the link success information.

An operation method of a wearable device, comprising:

• authenticating a user by verifying user identification information of the user;
• detecting contact between the authenticated user and the wearable device;
• and
• providing a link success information to an electronic device requiring user authentication during the contact after success of the authenticating of the user.

An operation method of a system which includes a wearable device and an electronic device requiring user authentication, the operation method comprising:

• authenticating, at the wearable device, a user by verifying user identification information of the user;
• detecting, at the wearable device, contact between the authenticated user and the wearable device;
• providing, at the wearable device a link success information to the electronic device during the contact after success of the authenticating of the user;
• and
• receiving, at the electronic device, the link success information thereby unlocking the electronic device.