Patent ID: 8914877

Claim:
A method for unlocking a handheld device with a touch screen, comprising: storing login information of a social network in a storage system of the handheld device; accessing the social network by the login information stored in the storage system; acquiring information of a plurality of friends from the social network to store in the storage system, wherein information of one of the plurality of friends comprises a primary key and a secondary key; selecting a first amount of the primary key and a second amount of the secondary key from the storage system; creating an unlocking interface on the touch screen according to the second amount of the secondary key and a question based on the first amount of the primary key; detecting an input event of a user on the unlocking interface; determining whether the input event corresponds to an answer linked with the question; and transitioning the handheld device from a lock state to an unlock state upon the condition that the input event corresponds to the answer.