公开(公告)号：US12282052B2

公开(公告)日：2025-04-22

申请号：US17795997

申请日：2021-01-29

Applicant: University of Rhode Island Board of Trustees

Inventor： Ken Qing Yang ,  Tao Wei ,  Zhenyu Xu

IPC: G01R31/11 ,  G01R31/08

Abstract: Method and apparatus for detecting in impedance change in a transmission line, such as a line in a computer bus. A CMOS-compatible time domain reflectometer circuit comprising a comparator is embedded in one or more chips and connected to the transmission line. The circuit measures the impedance inhomogeneity pattern (IIP) of the transmission line prior to use, and then repeatedly measures the HP during operation of the transmission line to detect a change in IIP, without Interfering with data transfer through the transmission line. The present invention can detect and locate wire-tapping magnetic probing or snooping, and Trojan and cold boot attacks on interconnecting buses between computer chips or integrated circuits in a computer system, such as on external memory buses.

公开(公告)号：US20230050241A1

公开(公告)日：2023-02-16

申请号：US17795997

申请日：2021-01-29

Applicant: University of Rhode Island Board of Trustees

Inventor： Ken Qing Yang ,  Tao Wei ,  Zhenyu Xu

IPC: G01R31/11 ,  G01R31/08

Abstract: Method and apparatus for detecting in impedance change in a transmission line, such as a line in a computer bus. A CMOS-compatible time domain reflectometer circuit comprising a comparator is embedded in one or more chips and connected to the transmission line. The circuit measures the impedance inhomogeneity pattern (IIP) of the transmission line prior to use, and then repeatedly measures the HP during operation of the transmission line to detect a change in IIP, without Interfering with data transfer through the transmission line. The present invention can detect and locate wire-tapping magnetic probing or snooping, and Trojan and cold boot attacks on interconnecting buses between computer chips or integrated circuits in a computer system, such as on external memory buses.