Patent ID: 8405624

Claim:
A security protection system for an electronic device, the security protection system comprising: a magnetic stylus; at least one coil received in the electronic device configured for inducing an induced current when the magnetic stylus moves relative to the at least one coil; a memory; and a processor electronically connected to the at least one coil, the processor comprising: a status module configured for setting the security protection system in a lock state or an unlock state in a preset time; a lock module electrically coupled to the status module, and configured for storing parameters of the induced current as a password into the memory in the lock state; and an unlock module electrically coupled to the status module, and configured for comparing inputted parameters of the induced current with the password stored in the memory, and detecting whether an unlock operation is successful; wherein the number of the at least one coil is one, the lock module further comprises a time module configured for capturing the time interval between the change in the direction of the induced current and time interval of occurrence of the induced current, and the parameters of the induced current comprise at least one of frequency of the change in the direction of the induced current and the time interval between the change and time interval of occurrence of the induced current.