According to the prior art, when requesters having different IO access processing abilities compete when accessing a target, latency is extended via accesses from a requester having a lower IO access performance, according to which the number of IOs issued per unit time cannot be increased, and the processing performance of the system cannot be improved. Q for all points Q on the elliptic curve: and using smaller representations ki of the scalar k in combination with the mapping to compute the scalar multiple of the elliptic curve point Q. Further, the monopoly compact grit of the present invention is produced from a seed of a mono-crystal of diamond or cubic boron nitride surrounded by either a self-grown crystal layer or an integrally bonded poly-crystalline sintered compact layer. or higher or the number of frictions until the fiber is broken in an abrasion test according to method B for measuring abrasion resistance in the Testing Methods for Spun Yarn is 100,000 or larger.