SECURITY PAPER, METHOD AND DEVICE FOR CHECKING THE AUTHENTICITY OF DOCUMENTS RECORDED THEREON

摘要

A safety paper with an embedded electronic circuit (1, 4, 7) is used to crea te more effective forgery-proof securities such as bank notes. In order to chec k authenticity, a carrier-frequency signal is transmitted to the circuit and a n output signal representing an authenticating feature is emitted from said circuit in response to said input signal and detected.