HACKING DETECTING CIRCUIT OF SMART CARD HAVING COMPLEX STRUCTURE USING COUNTER

摘要

PURPOSE: A hacking detecting circuit of a smart card having a complex structure using a counter is provided to remove an active shield layer and prevent a chip card from hacking by making the hacking detecting circuit using the active shield layer have the complex structure using the counter, and prevent the chip card from hacking more strictly by making the hacking detecting circuit pass all layers. CONSTITUTION: A shield layer counter(210) performs counting by using the shield layer as a part of a circuit. A normal layer counter(310) counts an output clock of a clock supplying circuit(100) by using the non-shield layer as the part of the circuit. A comparator(410) compares a count value of the shield layer counter with the count value of the normal layer counter, and judges the hacking of the chip card by determining sameness of the count values. A reset part resets the chip card in case that the hacking is detected by an output value of the comparator.