Electronic device

An electronic device comprising:

• a plurality of sensors comprising at least at least one of a fingerprint sensor, a microphone, an inertial sensor, a touch sensor, or an illumination sensor in addition to a camera, a second sensor, and a third sensor;
• a communication device;
• and
• a controller configured to:
• generate a first authentication information based on sensing performed by the camera and a second authentication information based on sensing performed by the second sensor;
• determine a total security level score using a first security level corresponding to the first authentication information and a second security level score corresponding to the second authentication information;
• determine whether a target service or a target external device is accessible based on the total security level score;
• and
• in response to authentication errors that occur equal to or greater than a predetermined number of times when an image captured by the camera does not coincide with a prestored image, cause the communication device to transmit the image to a predetermined external device, wherein a security level score is set differently based on a type of authentication information generated based on a corresponding one of the plurality of sensor, wherein the controller is further configured to:
• based on a determination that a first time lapse has occurred after generating the first authentication information:
• invalidate the generated first authentication information by subtracting the first security level score from the total score,
• deactivate the camera, and
• generate a third authentication information based on sensing performed by the third sensor, wherein the total security level score is redetermined using the generated third authentication information;
• and
• based on a determination that a second time lapse has occurred after generating the second authentication information:
• invalidate the generated second authentication information by subtracting the second security level score from the total score,
• deactivate the second sensor, and
• generate the third authentication information based on sensing performed by the third sensor, wherein the total security level score is redetermined by using the generated third authentication information.