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In ubiquitous computing environment, identification of objects and places in the real world is important, and 2-D printing code is useful to store identifiers of them. However, since it is easy to modify the content stored in the 2-D code, we must verify whether the identifier written in the 2-D code is indeed issued by the authorized organization. In this paper, we propose a verification method for identifiers stored in the 2-D code. Our system makes sure that the identifier is indeed issueddoi:10.1109/ainaw.2007.368 dblp:conf/aina/KaminaAEKYS07 fatcat:bug2osbd3vbjjnx7pd72e4rzdm