TAX ADMINISTRATION METHOD, TAX ADMINISTRATION SYSTEM, TRANSACTION INFORMATION ADMINISTRATION DEVICE, AND AUTHENTICATION SERVER

摘要

A tax administration method comprises: a step of a storefront register terminal transmitting a first transaction information hash value to a transaction information administration device; a step of the transaction information administration device computing a first identifying information hash value, and transmitting same to a transaction information encryption device; a step of the transaction information encryption device transmitting first encrypted transaction information to the transaction information administration device; a step of the transaction information administration device associating the received information with a transaction information administration device ID and transmitting same to the storefront register terminal; a step of the storefront register terminal issuing a receipt; a step of a transaction information input device transmitting receipt printing information to an authentication server; a step of the authentication server associating the transaction information administration device ID and an encryption key and storing same; a step of the authentication server specifying the encryption key; a step of the authentication server computing a second transaction information hash value and a second identifying information hash value; a step of generating second encrypted transaction information; and a step of authenticating the validity of the transaction by comparing the first transaction information hash value with the second transaction information hash value, the first identifying information hash value with the second identifying information hash value, and the first encrypted transaction information with the second encrypted transaction information.