Interference pulse - detection circuit, smart card and interference pulse attack - a protection method

摘要

The present invention relates to a disturbance pulse - detection circuit, an associated smart card and an associated method for the protection of integrated circuits against attack by disruptive. According to the invention, the interference pulse - detection circuit includes a first voltage divider (122) and a second voltage divider (124), each of which has at least two resistors (r12, r11, r22, r21) in series between an operating voltage (vdd) and ground (gnd), a voltage comparator (140) with a first input terminal (compin1), which is provided with a first node (s1) of the first voltage divider (122) is coupled to a first node voltage v (v1) to receive data, and a second input terminal (compin2) which, together with a second node (s2) of the second voltage divider (124) is coupled to a second node voltage v (v2) to receive data, wherein the comparator (140) a first reference signal (vcomp) at the output terminal (compout) as a function of the node voltage difference (v2 - v1) is generated, a buffer (160) for buffering of the first comparison signal (vcomp), in order to a first detection signal (180), and a capacitor (c1, c2), which occurs between the first node (s1) and / or the second node (s2) and ground (gnd) is looped. Use of, for example, for smart cards.