Method of checking authenticity of sheet with built-in electronic circuit chip

A system for detecting forgery of a sheet, said system including a forgery detecting device and a memory device which are connected via a network,

• said forgery detecting device including a control unit, a scanning unit and a discriminating unit,
• said sheet including information obtainable by said scanning unit and an electronic circuit chip which stores a unique number,
• said memory device storing unique information correlated with said unique number, said unique information being unique to said sheet, said electronic circuit chip or a combination of the sheet and the electronic circuit chip,
• said control unit reading out said stored unique number from said electronic circuit chip provided in said sheet,
• said control unit obtaining from said memory device said stored unique information correlated with said unique number and unique to said sheet, said electronic circuit chip or a combination of the sheet and the electronic circuit chip,
• said scanning unit acquiring said information obtainable by said scanning unit, by scanning said sheet, and
• said discriminating unit comparing said unique information unique to said sheet, said electronic circuit chip or a combination of the sheet and the electronic circuit chip with said information obtained by scanning said sheet to discriminatively determine whether the information acquired from said sheet is authentic.