An exemplary housing of a foldable electronic device includes a first cover, a second cover, a latching member, a contact member, and a resilient member. The method may comprise creating a map indicating a plurality of locations of application instruction sections within instructions of a computer software application. In the trellis diagram, each state at one stage is connected to a state at the next stage by a branch and a group of connected branches form a path. The encryption key can be read from the outside of the IC solely during the initialization phase.