Patent ID: 7941361
Filing Date: 2011-05-10
Classification: G06Q

Abstract:
1. A quantitative competition method for a system in which a plurality of participant devices send their secret aimed values to a server device and said server device determines which of said plurality of participant devices has offered the maximum or minimum one of said aimed values received, and in which there is provided a conversion table showing the relationships between a sequence of values selectable as said aimed values and a sequence of indexes k of integral values respectively corresponding thereto, and m=1, 2, . . . , M, M being an integer equal to or greater than 2; said method comprising the steps wherein: (a) each of said participant devices processes, with a predetermined one-way function h and through the use of said conversion table, information k(+)b (b) said server device publishes its received aimed value information on a bulletin board accessible from all of said participant devices; (c) said server device obtains said random number R (d) letting a be a predetermined value with which said select information b (e) said server device checks said aimed values on said bulletin board for matching with said calculated h(k(+)a(+)R (f) if a match is detected in said step (e), said server device decides that the aimed value of the aimed value information of a participant device having sent said random number R