Circuit for detecting malfunction generation attack and integrated circuit using the same

An integrated circuit, comprising at least:

• a control system;
• and
• a malfunction generation attack detecting circuit for detecting a malfunction generation attack, said control system and said malfunction generation attack detecting circuit for detecting a malfunction generation attack being integrated in said integrated circuit,
• wherein said malfunction generation attack detecting circuit for detecting a malfunction generation attack includes
• at least one sensor circuit adapted to detect a radiation of a light, and
• a detection circuit for detecting an intermediate voltage between a voltage corresponding to a High level and a voltage corresponding to a Low level in accordance with an output from said at least one sensor circuit, and outputting a detection signal,
• said at least one sensor circuit has an output node a level at which is changed in accordance with the radiation of the light, and outputs a signal corresponding to the level at said output node which is changed in accordance with the radiation of the light, and
• said detection circuit outputs the detection signal to said control system when a level of the output signal from said at least one sensor circuit reaches a level previously set.