Device which executes authentication processing by using offline information, and device authentication method

摘要

A computer includes a unit (23) which reads out authentication data recorded on a portable recording medium (16) by another device(A), a recording unit (25) which records the authentication data read out by the unit, and an authentication unit (20, 32) which performs mutual authentication processing between the authentication unit and the another device (A) by using the authentication data recorded in the recording unit. <IMAGE>