公开(公告)号：US10964649B2

公开(公告)日：2021-03-30

申请号：US16054099

申请日：2018-08-03

Applicant: Arm Limited

Inventor： Subbayya Chowdary Yanamadala ,  Mikael Yves Marie Rien

IPC: H01L23/00 ,  G01R31/28 ,  H03K3/03 ,  H04L9/32 ,  G01R31/317 ,  G01N29/02 ,  G06F21/87 ,  G01N27/04

Abstract: A system with tamper detection can include at least one ring oscillator and a detection circuit coupled to the at least one ring oscillator to detect change in frequency greater than a tolerance. Each ring oscillator can include a plurality of inverters where at least one intermediate node coupling an output of one of the plurality of inverters and an input to another of the plurality of inverters is a sensing node of a plurality of sensing nodes for the system. Outputs from two or more ring oscillators can be compared and a signal to initiate a countermeasure response can be generated when the outputs have a difference greater than a tolerance value.

公开(公告)号：US11082202B2

公开(公告)日：2021-08-03

申请号：US15996134

申请日：2018-06-01

Applicant: Arm Limited

Inventor： Subbayya Chowdary Yanamadala ,  Mikael Yves Marie Rien ,  Anish Dhanekula ,  Roma Rudra

IPC: H04L29/06 ,  H04L9/00 ,  G06F21/75 ,  H01L23/00

Abstract: A system with fault injection attack detection can include a circuit block; at least one independent power network; a detector coupled to the at least one independent power network to detect a change in a power characteristic of the independent power network; and sensors coupled to the at least one independent power network and located in an active layer of a chip with the circuit block. The sensors are responsive to at least one type of fault injection attack. In some cases, the sensors can be inverters.

公开(公告)号：US10770410B2

公开(公告)日：2020-09-08

申请号：US16054123

申请日：2018-08-03

Applicant: Arm Limited

Inventor： Mikael Yves Marie Rien ,  Subbayya Chowdary Yanamadala

IPC: H01L25/00 ,  H01L23/00

Abstract: A system with circuit alteration detection can include a shield in at least one metal layer over an integrated circuit, and a detector coupled to the shield to detect a change in impedance characteristics of one or more shield lines of the shield due to physical alteration of the shield. The shield lines can be arranged in one or more metal layers and cover an area with shape arrangements such as parallel lines and serpentines. The detector can include one or more comparators to detect a difference in impedance of more than a tolerance value. An appropriate countermeasure response can be initiated upon detection of the difference in impedance.