▎ 摘　　要

NOVELTY - The device has a cover (120) made of a metallic material to protect the device from external intrusion and damage. The contacts are formed or connected to a predetermined position of a conductive coating portion. A connector (140) is in electrical connection with the contact and is located between the cover and the substrate. An illegal operation detection unit (150) detects electrical separation of the connector and the contact. A control unit (151) erases or disables data of the device according to a signal transmitted from the illegal operation detection unit, to protect the device from external attacks by erasing or inoperating data stored in the device that requires data protection. The graphene lines are connected to illegal operation detection unit and detect vibration of the cover. The illegal operation detection unit detects an external illegal operation as vibration of cover is detected on graphene lines and transmits the illegal operation to control unit. USE - Security device for protecting important circuits and mounted information inside electronic device. ADVANTAGE - The critical areas of the board on which the components requiring information and circuit protection are mounted from external intrusion are protected. The security device is capable of protecting all chips and important information by detecting all of a certain external force applied to the cover for illegal manipulation. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the security device for electronic device. Base (110) Cover (120) Connector (140) Illegal operation detection unit (150) Control unit (151)