公开(公告)号：US20210148957A1

公开(公告)日：2021-05-20

申请号：US16936169

申请日：2020-07-22

Applicant: Google LLC

Inventor： Emre Tuncer ,  Huachang Xu ,  Ramprasad Raghavan ,  Fanny Gur ,  Manish Harnur

IPC: G01R19/165 ,  H03K5/00 ,  G06F1/10 ,  G06F21/75

Abstract: Detecting voltage-based attacks on an integrated circuit (IC) is difficult in the presence of clock jitter. Propagating signals can exhibit a total delay that is due to a delay component resulting from a voltage-based attack and a delay characteristic resulting from clock fluctuation. Voltage-variation detection circuitry includes first and second voltage-dependent circuits and a voltage analysis circuit. The voltage-dependent circuits produce first and second signals that are indicative of a voltage level responsive to a clock signal and based on different first and second voltage sensitivities. The voltage analysis circuit generates a voltage alert signal based on the first and second signals. A combined signal neutralizes the delay characteristic in the first and second signals, but the delay component due to the voltage variation can be at least partially maintained. Thus, a voltage-based attack is detectable in the presence of clock fluctuation by using two voltage-dependent circuits.

公开(公告)号：US11486911B2

公开(公告)日：2022-11-01

申请号：US16936169

申请日：2020-07-22

Applicant: Google LLC

Inventor： Emre Tuncer ,  Huachang Xu ,  Ramprasad Raghavan ,  Fanny Gur ,  Manish Harnur

IPC: G01R19/165 ,  G06F21/75 ,  G06F1/10 ,  H03K5/00

Abstract: Detecting voltage-based attacks on an integrated circuit (IC) is difficult in the presence of clock jitter. Propagating signals can exhibit a total delay that is due to a delay component resulting from a voltage-based attack and a delay characteristic resulting from clock fluctuation. Voltage-variation detection circuitry includes first and second voltage-dependent circuits and a voltage analysis circuit. The voltage-dependent circuits produce first and second signals that are indicative of a voltage level responsive to a clock signal and based on different first and second voltage sensitivities. The voltage analysis circuit generates a voltage alert signal based on the first and second signals. A combined signal neutralizes the delay characteristic in the first and second signals, but the delay component due to the voltage variation can be at least partially maintained. Thus, a voltage-based attack is detectable in the presence of clock fluctuation by using two voltage-dependent circuits.

公开(公告)号：US20230131119A1

公开(公告)日：2023-04-27

申请号：US18051442

申请日：2022-10-31

Applicant: Google LLC

Inventor： Emre Tuncer ,  Huachang Xu ,  Ramprasad Raghavan ,  Fanny Gur ,  Manish Harnur

IPC: G01R19/165 ,  G06F21/75 ,  G06F1/10 ,  H03K5/00

Abstract: Detecting voltage-based attacks on an integrated circuit (IC) is difficult in the presence of clock jitter. Propagating signals can exhibit a total delay that is due to a delay component resulting from a voltage-based attack and a delay characteristic resulting from clock fluctuation. Voltage-variation detection circuitry includes first and second voltage-dependent circuits and a voltage analysis circuit. The voltage-dependent circuits produce first and second signals that are indicative of a voltage level responsive to a clock signal and based on different first and second voltage sensitivities. The voltage analysis circuit generates a voltage alert signal based on the first and second signals. A combined signal neutralizes the delay characteristic in the first and second signals, but the delay component due to the voltage variation can be at least partially maintained. Thus, a voltage-based attack is detectable in the presence of clock fluctuation by using two voltage-dependent circuits.