A plasma processing apparatus is disclosed in which a wafer mounted on a sample stage arranged in a processing chamber in a vacuum vessel is processed using a plasma formed in the processing chamber. A data string including a plurality of pieces arranged in an order is hashed using a hash function to determine a plurality of authentication checkpoint hashes associated with the pieces. As a result more light is coupled back into the core at the sub-regioncore interface. The at least one signature may then be used for processing such as e. When the stent cover use as cover of stent body placed in body duct like the vessel, it provides that maintains lumen in a state of patency over a long period of time and has an effect of preventing restenosis.