A · T Communications Co., Ltd.

Kishi Hideaki

Youichi Azuma

Ken-ichi Sakina

Shinotani Tomoko

Azuma Youichi

A two-dimensional code authenticating device reads a self-authentication two-dimensional code to obtain an RS bit string, and detects a bit string c' as an error using the RS bit string. Next, an exclusive OR between a bit string l included in the RS bit string and the bit string c&#x2032; detected as an error is calculated to obtain a bit string c&#x2032;, and a bit string md is obtained by decrypting the bit string c&#x2032; through a scheme corresponding to the encryption. Subsequently, it is determined whether or not the decrypted bit string md matches the bit string m included in the RS bit string, thereby authenticating the self-authentication two-dimensional code.

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Tokyo, Japan

Kishi Hideaki