The present invention teaches a method for designing an integrated circuit. A reel is made to reciprocate on the core surface of an annular core transversely at a predetermined position and the annular core is made to perform pendulum motion about a fulcrum, i. In an embodiment, the second signal may include comparing the second signal with an output signal of a first feedback module. the identity of a user client and the identity of a requested service, associated with a request for a long term key is stored in a key management system for later retrieval. At least one of the backing sheet or cover sheet has a transparent portion in alignment with the dry indicating composition, and wherein the cover sheet may be peeled from the backing sheet and resealed.