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This paper proposed a personal authentication system using small resources for home use. The following three goals were achieved at the same time by this system: (1) identification of each individual, (2) unique existence of each individual in the specified time and space, and (3) no contradiction in the existence of each individual in view of the space and the time before and after an event. Considering use in homes, the evaluation system consists of an embedded MPU and a real-time operating system, using little resources. This evaluation system showed correct fundamental operation satisfying all above three conditions.