Shape actuation encapsulant of a cryptographic module

    公开(公告)号:US10325121B2

    公开(公告)日:2019-06-18

    申请号:US15810884

    申请日:2017-11-13

    摘要: To provide for a physical security mechanism that forms a complete envelope of protection around the cryptographic module to detect and respond to an unauthorized attempt at physical access, a tamper sensing encapsulant generally encapsulates the cryptographic module. The tamper sensing encapsulant includes a first shape actuation layer associated with an electrically conductive first trace element and a second shape actuation layer associated with an electrically conductive second trace element. The first shape actuation layer is positioned against the second shape actuation layer such that the first trace element and the second trace element do not physically touch at an operating temperature of the cryptographic module and do physically touch when the first shape actuation layer and the second shape actuation layer are thermally loaded. Upon first trace element and the second trace element touching, a circuit is formed that disables the cryptographic module.

    CROSS SECTIONAL DEPTH COMPOSITION GENERATION UTILIZING SCANNING ELECTRON MICROSCOPY

    公开(公告)号:US20180151330A1

    公开(公告)日:2018-05-31

    申请号:US15880126

    申请日:2018-01-25

    IPC分类号: H01J37/28 G01N23/22 G01B15/00

    摘要: A method for generating cross-sectional profiles using a scanning electron microscope (SEM) includes scanning a sample with an electron beam to gather an energy-dispersive X-ray spectroscopy (EDS) spectrum for an energy level to determine element composition across an area of interest. A mesh is generated to locate positions where a depth profile will be taken. EDS spectra are gathered for energy levels at mesh locations. A number of layers of the sample are determined by distinguishing differences in chemical composition between depths as beam energies are stepped through. A depth profile is generated for the area of interest by compiling the number of layers and the element composition across the mesh.