major review work
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@comment{x-kbibtex-encoding=utf-8}
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@comment{x-kbibtex-encoding=utf-8}
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@Book{anderson2020,
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@Book{anderson2020,
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||||||
author = {Ross Anderson},
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author = {Ross Anderson},
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||||||
date = {2020-09-16},
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date = {2020-09-16},
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||||||
title = {Security Engineering},
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title = {Security Engineering},
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||||||
isbn = {978-1-119-64281-7},
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isbn = {978-1-119-64281-7},
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||||||
}
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}
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||||||
@techreport{gs21,
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@techreport{gs21,
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||||||
author = {{\censorIfSubmission{Jan Sebastian Götte and Björn Scheuermann}}},
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author = {{\censorIfSubmission{Jan Sebastian Götte and Björn Scheuermann}}},
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||||||
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@ -71,13 +71,13 @@
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||||||
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title = {Cocoon-PUF, a novel mechatronic secure element technology},
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year = {2012}
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}
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}
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||||||
@Patent{rahman1988,
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@Patent{rahman1988,
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||||||
author = {Mujib Rahman},
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author = {Mujib Rahman},
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||||||
date = {1988-03-10},
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date = {1988-03-10},
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||||||
number = {US Patent US4859024A},
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number = {US Patent US4859024A},
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||||||
title = {Optical fiber cable with tampering detecting means},
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title = {Optical fiber cable with tampering detecting means},
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}
|
}
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|
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@www{haines2006,
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@www{haines2006,
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author = {Lester Haines},
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author = {Lester Haines},
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@ -97,39 +97,86 @@
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||||||
url = {https://dl.acm.org/doi/fullHtml/10.1145/3380774.3382016},
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url = {https://dl.acm.org/doi/fullHtml/10.1145/3380774.3382016},
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urldate = {2020-10-22}
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urldate = {2020-10-22}
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}
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}
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||||||
|
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||||||
@Article{albartus2020,
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@Article{albartus2020,
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||||||
author = {Nils Albartus and Max Hoffmann and Sebastian Temme and Leonid Azriel and Christof Paar},
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author = {Nils Albartus and Max Hoffmann and Sebastian Temme and Leonid Azriel and Christof Paar},
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date = {2020},
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date = {2020},
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title = {{DANA} Universal Dataflow Analysis for Gate-Level Netlist Reverse Engineering},
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title = {{DANA} Universal Dataflow Analysis for Gate-Level Netlist Reverse Engineering},
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||||||
doi = {10.13154/tches.v2020.i4.309-336},
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doi = {10.13154/tches.v2020.i4.309-336},
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||||||
number = {4},
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number = {4},
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||||||
pages = {309–336},
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pages = {309–336},
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||||||
volume = {2020},
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volume = {2020},
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||||||
bibsource = {dblp computer science bibliography, https://dblp.org},
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bibsource = {dblp computer science bibliography, https://dblp.org},
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||||||
biburl = {https://dblp.org/rec/journals/tches/AlbartusHTAP20.bib},
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biburl = {https://dblp.org/rec/journals/tches/AlbartusHTAP20.bib},
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||||||
journal = {{IACR} Transactions on Cryptographic Hardware and Embedded Systems},
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journal = {{IACR} Transactions on Cryptographic Hardware and Embedded Systems},
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year = {2020},
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year = {2020},
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}
|
}
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|
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@InProceedings{trippel2017,
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@InProceedings{trippel2017,
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author = {Timothy Trippel and Ofir Weisse and Wenyuan Xu and Peter Honeyman and Kevin Fu},
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author = {Timothy Trippel and Ofir Weisse and Wenyuan Xu and Peter Honeyman and Kevin Fu},
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booktitle = {2017 IEEE European symposium on security and privacy},
|
booktitle = {2017 IEEE European symposium on security and privacy},
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title = {WALNUT: Waging doubt on the integrity of MEMS accelerometers with acoustic injection attacks},
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title = {WALNUT: Waging doubt on the integrity of MEMS accelerometers with acoustic injection attacks},
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organization = {IEEE},
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organization = {IEEE},
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pages = {3–18},
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pages = {3–18},
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year = {2017},
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year = {2017},
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}
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}
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@WWW{heise2020t2jailbreak,
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@WWW{heise2020t2jailbreak,
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author = {Leo Becker},
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author = {Leo Becker},
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date = {2020-03-11},
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date = {2020-03-11},
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title = {Jailbreaker nehmen T2-Sicherheitschip von Macs ins Visier},
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title = {Jailbreaker nehmen T2-Sicherheitschip von Macs ins Visier},
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url = {https://www.heise.de/mac-and-i/meldung/Jailbreaker-nehmen-T2-Sicherheitschip-von-Macs-ins-Visier-4681131.html},
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url = {https://www.heise.de/mac-and-i/meldung/Jailbreaker-nehmen-T2-Sicherheitschip-von-Macs-ins-Visier-4681131.html},
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organization = {Heise Online},
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organization = {Heise Online},
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publisher = {Heise Online},
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publisher = {Heise Online},
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}
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}
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@WWW{faa2018,
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author = {US Federal Aviation Administration},
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date = {2018-05-31},
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title = {Pack Safe: Batteries, lithium},
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url = {https://www.faa.gov/hazmat/packsafe/more_info/?hazmat=7},
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publisher = {US Federal Aviation Administration},
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}
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@WWW{heise2021ovh,
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author = {Martin Holland},
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date = {2021-03-10},
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title = {Cloud-Dienstleister OVH: Feuer zerstört Rechenzentrum, ein weiteres beschädigt},
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url = {https://www.heise.de/news/OVH-Feuer-zerstoert-Rechenzentrum-in-Strassburg-ein-weiteres-beschaedigt-5076320.html},
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organization = {Heise Online},
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publisher = {Heise Online},
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}
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@WWW{signal2019,
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author = {Joshua Lund},
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date = {2019-12-19},
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title = {Technology Preview for secure value recovery},
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url = {https://signal.org/blog/secure-value-recovery/},
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organization = {signal.org},
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publisher = {signal.org},
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}
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@InProceedings{ongaro2019,
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author = {Diego Ongaro and John Ousterhout},
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title = {In Search of an Understandable Consensus Algorithm},
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booktitle = {2014 {USENIX} Annual Technical Conference ({USENIX} {ATC} 14)},
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year = {2014},
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isbn = {978-1-931971-10-2},
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address = {Philadelphia, PA},
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pages = {305--319},
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url = {https://www.usenix.org/conference/atc14/technical-sessions/presentation/ongaro},
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publisher = {{USENIX} Association},
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month = jun,
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}
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@WWW{thales2015hsmha,
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author = {Gemalto NV},
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date = {2015-12-18},
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title = {SafeNet PCI-E HSM 6.2 Product Documentation: High Availability (HA) Overview},
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url = {https://thalesdocs.com/gphsm/luna/6.2/docs/pci/Content/administration/ha/ha_overview.htm},
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publisher = {Gemalto NV},
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}
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@article{kim2018,
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@article{kim2018,
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author = {Seung Hyun Kim and Su Chang Lim and others},
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author = {Seung Hyun Kim and Su Chang Lim and others},
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@ -141,27 +188,27 @@
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year = {2018}
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year = {2018}
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}
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}
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@Conference{johnson2018,
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@Conference{johnson2018,
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author = {Scott Johnson and Dominic Rizzo and Parthasarathy Ranganathan and Jon McCune and Richard Ho},
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author = {Scott Johnson and Dominic Rizzo and Parthasarathy Ranganathan and Jon McCune and Richard Ho},
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booktitle = {Hot Chips: A Symposium on High Performance Chips},
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booktitle = {Hot Chips: A Symposium on High Performance Chips},
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date = {2018},
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date = {2018},
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title = {Titan: enabling a transparent silicon root of trust for Cloud},
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title = {Titan: enabling a transparent silicon root of trust for Cloud},
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url = {https://www.hotchips.org/hc30/1conf/1.14_Google_Titan_GoogleFinalTitanHotChips2018.pdf},
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year = {2018},
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}
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}
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@TechReport{isaacs2013,
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@TechReport{isaacs2013,
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author = {Phil Isaacs and Thomas {Morris Jr} and Michael J Fisher and Keith Cuthbert},
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author = {Phil Isaacs and Thomas {Morris Jr} and Michael J Fisher and Keith Cuthbert},
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date = {2013},
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date = {2013},
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institution = {Surface Mount Technology Association},
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institution = {Surface Mount Technology Association},
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title = {Tamper proof, tamper evident encryption technology},
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title = {Tamper proof, tamper evident encryption technology},
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booktitle = {Pan Pacific Microelectronics Symposium},
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booktitle = {Pan Pacific Microelectronics Symposium},
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year = {2013},
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}
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}
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@inproceedings{drimer2008,
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@inproceedings{drimer2008,
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author = {Saar Drimer and Steven J Murdoch and Ross Anderson},
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@WWW{terdiman2013,
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@WWW{terdiman2013,
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author = {Daniel Terdiman},
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author = {Daniel Terdiman},
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url = {https://www.cnet.com/news/aboard-americas-doomsday-command-and-control-plane},
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url = {https://www.cnet.com/news/aboard-americas-doomsday-command-and-control-plane},
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organization = {cnet.com},
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month = jul,
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publisher = {CNET},
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year = {2013},
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@Thesis{vrijaldenhoven2004,
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@Thesis{vrijaldenhoven2004,
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author = {Serge Vrijaldenhoven},
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author = {Serge Vrijaldenhoven},
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date = {2004-10-01},
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date = {2004-10-01},
|
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institution = {Technische Universiteit Eindhoven},
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institution = {Technische Universiteit Eindhoven},
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title = {Acoustical Physical Uncloneable Functions},
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title = {Acoustical Physical Uncloneable Functions},
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type = {mathesis},
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url = {https://pure.tue.nl/ws/files/46971492/600055-1.pdf},
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url = {https://pure.tue.nl/ws/files/46971492/600055-1.pdf},
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@WWW{dexter2015,
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date = {2015-12-27},
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url = {https://media.ccc.de/v/32c3-7368-shopshifting#t=2452},
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url = {https://media.ccc.de/v/32c3-7368-shopshifting#t=2452},
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organization = {32C3 Chaos Communication Congress},
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organization = {32C3 Chaos Communication Congress},
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}
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}
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@WWW{newman2020,
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@WWW{newman2020,
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author = {Lily Hay Newman},
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author = {Lily Hay Newman},
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date = {2020-10-06},
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date = {2020-10-06},
|
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title = {Apple's T2 Security Chip Has an Unfixable Flaw},
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title = {Apple's T2 Security Chip Has an Unfixable Flaw},
|
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url = {https://www.wired.com/story/apple-t2-chip-unfixable-flaw-jailbreak-mac/},
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url = {https://www.wired.com/story/apple-t2-chip-unfixable-flaw-jailbreak-mac/},
|
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organization = {Wired Magazine},
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organization = {Wired Magazine},
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}
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}
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@Article{sh2016,
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@Article{sh2016,
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author = {Maruthi G. S. and Vishwanath Hegde},
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author = {Maruthi G. S. and Vishwanath Hegde},
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date = {2016},
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date = {2016},
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journaltitle = {IEEE Sensors Journal},
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journaltitle = {IEEE Sensors Journal},
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title = {Application of MEMS Accelerometer for Detection and Diagnosis of Multiple Faults in the Roller Element Bearings of Three Phase Induction Motor},
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title = {Application of MEMS Accelerometer for Detection and Diagnosis of Multiple Faults in the Roller Element Bearings of Three Phase Induction Motor},
|
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doi = {https://doi.org/10.1109/JSEN.2015.2476561},
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doi = {https://doi.org/10.1109/JSEN.2015.2476561},
|
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issn = {1558-1748},
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issn = {1558-1748},
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issue = {1},
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issue = {1},
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url = {https://www.researchgate.net/profile/Vishwanath-Hegde-2/publication/282389149_Application_of_MEMS_Accelerometer_for_Detection_and_Diagnosis_of_Multiple_Faults_in_the_Roller_Element_Bearings_of_Three_Phase_Induction_Motor/links/568bace808aebccc4e1c01fa/Application-of-MEMS-Accelerometer-for-Detection-and-Diagnosis-of-Multiple-Faults-in-the-Roller-Element-Bearings-of-Three-Phase-Induction-Motor.pdf},
|
url = {https://www.researchgate.net/profile/Vishwanath-Hegde-2/publication/282389149_Application_of_MEMS_Accelerometer_for_Detection_and_Diagnosis_of_Multiple_Faults_in_the_Roller_Element_Bearings_of_Three_Phase_Induction_Motor/links/568bace808aebccc4e1c01fa/Application-of-MEMS-Accelerometer-for-Detection-and-Diagnosis-of-Multiple-Faults-in-the-Roller-Element-Bearings-of-Three-Phase-Induction-Motor.pdf},
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volume = {16},
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volume = {16},
|
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}
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}
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|
|
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@Article{kvk2019,
|
@Article{kvk2019,
|
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author = {Ivar Koene and Raine Viitala and Petri Kuosmanen},
|
author = {Ivar Koene and Raine Viitala and Petri Kuosmanen},
|
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date = {2019},
|
date = {2019},
|
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journaltitle = {IEEE Access},
|
journaltitle = {IEEE Access},
|
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title = {Internet of Things Based Monitoring of Large Rotor Vibration With a Microelectromechanical Systems Accelerometer},
|
title = {Internet of Things Based Monitoring of Large Rotor Vibration With a Microelectromechanical Systems Accelerometer},
|
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doi = {https://doi.org/10.1109/ACCESS.2019.2927793},
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doi = {https://doi.org/10.1109/ACCESS.2019.2927793},
|
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}
|
}
|
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|
|
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@TechReport{adc2019,
|
@TechReport{adc2019,
|
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author = {Bertrand Campagnie},
|
author = {Bertrand Campagnie},
|
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date = {2019},
|
date = {2019},
|
||||||
institution = {Analog Devices},
|
institution = {Analog Devices},
|
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title = {Choose the Right Accelerometer for Predictive Maintenance},
|
title = {Choose the Right Accelerometer for Predictive Maintenance},
|
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url = {https://www.analog.com/media/en/technical-documentation/tech-articles/Choose-the-Right-Accelerometer-for-Predictive-Maintenance.pdf},
|
url = {https://www.analog.com/media/en/technical-documentation/tech-articles/Choose-the-Right-Accelerometer-for-Predictive-Maintenance.pdf},
|
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urldate = {2021-04-01},
|
urldate = {2021-04-01},
|
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}
|
}
|
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|
|
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@PhdThesis{e2013,
|
@PhdThesis{e2013,
|
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author = {Maged Elsaid Elnady},
|
author = {Maged Elsaid Elnady},
|
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date = {2013},
|
date = {2013},
|
||||||
institution = {University of Manchester},
|
institution = {University of Manchester},
|
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title = {On-Shaft Vibration Measurement Using a MEMS Accelerometer for Faults Diagnosis in Rotating Machines},
|
title = {On-Shaft Vibration Measurement Using a MEMS Accelerometer for Faults Diagnosis in Rotating Machines},
|
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url = {https://www.research.manchester.ac.uk/portal/files/54530535/FULL_TEXT.PDF},
|
url = {https://www.research.manchester.ac.uk/portal/files/54530535/FULL_TEXT.PDF},
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urldate = {2021-04-01},
|
urldate = {2021-04-01},
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}
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}
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|
|
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@Book{iaea2011,
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@Book{iaea2011,
|
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author = {{{International Atomic Energy Agency}}},
|
author = {{{International Atomic Energy Agency}}},
|
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date = {2011},
|
date = {2011},
|
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title = {Safeguards, techniques and equipment},
|
title = {Safeguards, techniques and equipment},
|
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isbn = {978-92-0-118910-3},
|
isbn = {978-92-0-118910-3},
|
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series = {International Nuclear Verification Series},
|
series = {International Nuclear Verification Series},
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url = {https://www-pub.iaea.org/MTCD/Publications/PDF/nvs1_web.pdf},
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url = {https://www-pub.iaea.org/MTCD/Publications/PDF/nvs1_web.pdf},
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urldate = {2021-04-01},
|
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|
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volume = {1},
|
volume = {1},
|
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}
|
}
|
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|
|
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@Comment{jabref-meta: databaseType:biblatex;}
|
@Book{kelly1993,
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author = {S. Graham Kelly},
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edition = {2},
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date = {1993},
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title = {Fundamentals of Mechanical Vibrations},
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|
isbn = {0-07-230092-2},
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publisher = {McGraw-Hill},
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|
series = {McGraw-Hill Series in Mechanical Engineering},
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|
}
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|
@Book{dixon2007,
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author = {John C. Dixon},
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title = {The Shock Absorber Handbook},
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date = {2007},
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|
isbn = {978-0-470-51020-9},
|
||||||
|
publisher = {Wiley},
|
||||||
|
}
|
||||||
|
|
||||||
|
@Book{beards1996,
|
||||||
|
author = {C. F. Beards},
|
||||||
|
title = {Structural Vibration: Analysis and Damping},
|
||||||
|
date = {1996},
|
||||||
|
publisher = {Wiley},
|
||||||
|
isbn = {0-340-64580-6},
|
||||||
|
}
|
||||||
|
|
||||||
|
@InProceedings{irikura2012,
|
||||||
|
title = {High Acceleration Motions generated from the 2011 Pacific coast off Tohoku, Japan Earthquake},
|
||||||
|
author = {Irikura, K and Kurahashi, S},
|
||||||
|
date = {2012},
|
||||||
|
booktitle = {Proceedings of the 15th World Conference on Earthquake Engineering},
|
||||||
|
pages = {24-28},
|
||||||
|
}
|
||||||
|
|
||||||
|
@WWW{ika2002,
|
||||||
|
title = {A test procedure for airbags},
|
||||||
|
year = {2002},
|
||||||
|
organization = {Rheinisch-Westfälischen Technischen Hochschule (RWTH) Aachen, Institut für Kraftfahrwesen Aachen (IKA)},
|
||||||
|
publisher = {International Motor Vehicle Inspection Commitee},
|
||||||
|
series = {CITA Research study programme on Electronically controlled systems on vehicles},
|
||||||
|
}
|
||||||
|
|
||||||
|
@article{yoshimitsu1990,
|
||||||
|
author = {Fukushima, Yoshimitsu and Tanaka, Teiji},
|
||||||
|
date = {1990},
|
||||||
|
journaltitle = {Bulletin of the Seismological Society of America},
|
||||||
|
volume = {80},
|
||||||
|
issue = {4},
|
||||||
|
pages = {757 - 783},
|
||||||
|
issn = {0037-1106},
|
||||||
|
title = {A new attenuation relation for peak horizontal acceleration of strong earthquake ground motion in Japan},
|
||||||
|
url = {https://pubs.geoscienceworld.org/ssa/bssa/article-abstract/80/4/757/102395/A-new-attenuation-relation-for-peak-horizontal},
|
||||||
|
urldate = {2021-07-07}
|
||||||
|
}
|
||||||
|
|
||||||
|
@Comment{jabref-meta: databaseType:biblatex;}
|
||||||
|
|
|
||||||
|
|
@ -352,6 +352,102 @@ Using longitudinal gaps in the mesh, our setup allows direct air cooling of regu
|
||||||
powerful processing capabilities that greatly increase the maximum possible power dissipation of the payload. In an
|
powerful processing capabilities that greatly increase the maximum possible power dissipation of the payload. In an
|
||||||
evolution of our design, the spinning mesh could even be designed to \emph{be} a cooling fan.
|
evolution of our design, the spinning mesh could even be designed to \emph{be} a cooling fan.
|
||||||
|
|
||||||
|
\subsection{Long-term Operation}
|
||||||
|
|
||||||
|
Like with other HSMs, practical use may require an IHSM to continuously run for a decade or even longer. As with other
|
||||||
|
setups utilizing HSMs, a setup including IHSMs must be designed in a way that the failure of a small number of IHSMs
|
||||||
|
does not compromise the system's security or reliability. Neither IHSMs nor traditional HSMs can withstand fire or
|
||||||
|
flooding, so while a breach of security can be ruled out, a catastrophic failure of the device and erasure of data
|
||||||
|
cannot~\cite{heise2021ovh}. Traditionally, this problem is solved by storing all secrets in multiple, geographically
|
||||||
|
redundant HSMs~\cite{thales2015hsmha}. The problem of providing fault-tolerance in IHSMs is easier since they are based
|
||||||
|
on general-purpose computer hardware and use general-purpose operating systems and thus allow for state-of-the-art
|
||||||
|
database replication techniques to be applied. One example of this approach is a 2019 technology
|
||||||
|
demonstration~\cite{signal2019} created by the signal.org, the organization running the signal secure messenger app. In
|
||||||
|
this demonstration, signal.org have implemented the Raft consensus algorithm~\cite{ongaro2019} inside Intel SGX to
|
||||||
|
replicate state between redundant instances.
|
||||||
|
|
||||||
|
There are three main categories of challenges to an IHSM's longevity: Failure of components of the IHSM due to age and
|
||||||
|
wear, failure of the external power supply and spurious triggering of the intrusion alarm by changes in the IHSM's
|
||||||
|
environment. In the following paragraphs we will evaluate each of these categories in its practical impact.
|
||||||
|
|
||||||
|
\paragraph{Component failure.}
|
||||||
|
The failure mode of an IHSM's components is the same as in any other computer system and the same generic mitigation
|
||||||
|
techniques apply. The expected lifetime of electronic components can be increased by using higher-spec components and by
|
||||||
|
reducing thermal, mechanical and electrical stress. To reduce vibration stress on both rotor and stator, the rotor must
|
||||||
|
be balanced. The main mechanical failure mode of an IHSM's is failure of the shaft bearings. By incorporating knowledge
|
||||||
|
from other rotating devices that have a long lifetime such as cooling fans, this failure mode can be mitigated. A final
|
||||||
|
noteworthy mechanical failure mode of an IHSM is dust buildup on the optical components of the communication link. This
|
||||||
|
failure mode can be mitigated by routing cooling airflow such that it does not go past the communication link's optical
|
||||||
|
components, as well as by filtering cooling air at the device's intakes.
|
||||||
|
|
||||||
|
\paragraph{Power failure.}
|
||||||
|
\label{sec-power-failure}
|
||||||
|
After engineering an IHSM's components to survive years of continuous operation, the next major failure mode to be
|
||||||
|
considered is power loss. Traditional HSMs solve the need for an always-on backup power supply by carrying large backup
|
||||||
|
batteries. The low static power consumption of a traditional HSM's simple tamper detection circuitry allows for the use
|
||||||
|
of non-replaceable backup batteries. An IHSM in contrast would likely require a rechargeable backup battery since its
|
||||||
|
motor requires more power than the mesh monitoring circuit of a traditional HSM. In principle, a conventional
|
||||||
|
Uninterruptible Power Supply (UPS) can be used, but in practice a productized IHSM might have a small, simple UPS
|
||||||
|
integrated into its case. Conservatively assuming an average operating power consumption of $\SI{10}{\watt}$ for an
|
||||||
|
IHSM's motor, a single large laptop battery with a capacity of $\SI{100}{\watt\hour}$~\cite{faa2018} could already power
|
||||||
|
an IHSM for 10 hours continuously. If a built-in battery is undesirable, or if power outages of more than a few seconds
|
||||||
|
at a time are unlikely (e.g.\ because the IHSM is connected to an external UPS or generator), the IHSM's rotor itself
|
||||||
|
can be used as a flywheel for energy storage up to several seconds. By designing the IHSM's rotor to have low friction
|
||||||
|
loss and high mass (e.g.\ by coupling it to an actual metal flywheel), longer power outages can be bridged. % FIXME
|
||||||
|
|
||||||
|
\paragraph{Spurious alarms.}
|
||||||
|
A spurious alarm would be as catastrophic as a failure of a critical component of an IHSM. For this reason, the
|
||||||
|
likelihood of such an alarm failure must be minimized. In principle, there are two possible causes for a spurious alarm.
|
||||||
|
One is a component failure such as a mesh trace breaking under vibration. This failure mode can be mitigated in the same
|
||||||
|
way other failure modes are mitigated. The second possible cause is that the device is accelerated in excess of the
|
||||||
|
range expected by its designers. There are several possible causes why an IHSM might move during normal operation. The
|
||||||
|
IHSM may have to be transported between datacenters or relocated within a dataceter. Other vibrating machinery such as
|
||||||
|
backup generators or large hard disk storage arrays may conduct vibration through the rack the IHSM is mounted inside
|
||||||
|
into the IHSM. People working in the datacenter might bump the IHSM. Vibrations from nearby traffic such as trains may
|
||||||
|
couple through the ground into the datacenter and into the IHSM. Finally, earthquakes will couple through any reasonable
|
||||||
|
amount of vibration dampening.
|
||||||
|
|
||||||
|
There are two key points to note on vibration dampening. One, the instantaneous mechanical power of a vibrating motion
|
||||||
|
is proportional to the square of its amplitude when fixing frequency and the cube of its frequency when fixing
|
||||||
|
amplitude. This means that to reach a certain instantaneous acceleration, much more power is needed in a high-frequency
|
||||||
|
vibrating motion compared to lower frequencies. This observation interacts the second key point we want to note here:
|
||||||
|
An ideal vibration dampener works the better the higher the frequency, and has a lower bound below which it does no
|
||||||
|
longer dampen vibration transmission~\cite{kelly1993,beards1996,dixon2007}. In conclusion, these two observations mean
|
||||||
|
that if we wish to reduce the likelihood of false detections by our IHSM tamper alarm we can effectively achieve this
|
||||||
|
goal by damping high-frequency shock and vibration, as low-frequency shock or vibration components will not reach
|
||||||
|
accelerations large enough to cause a false alarm.
|
||||||
|
|
||||||
|
To put the above relations into perspective, consider that at an angular frequency of $\SI{1000}{rpm}$, we can expect an
|
||||||
|
IHSM's tamper sensor to measure an acceleration of about $\SI{100}{g}$. Even the strongest earthquakes rarely reach a
|
||||||
|
Peak Ground Acceleration (PGA) of $\SI{0.1}{g}$~\cite{yoshimitsu1990}. The highest measured PGA of the 2011 Tohoku
|
||||||
|
earthquake was approximately $\SI{0.3}{g}$. Since earthquake vibrations are low-frequency and happen across a large
|
||||||
|
geographic area, they nontheless dissipate a tremendous amound of mechanical power through an absolute acceleration that
|
||||||
|
may seem low at first glance, but we can largely ignore them for the purposes of our tamper detection system. As
|
||||||
|
another point of reference, consider a car crash. An acceleration above $\SI{10}{g}$ corresponds to a crash at roughly
|
||||||
|
$\SI{30}{\kilo\meter\per\hour}$~\cite{ika2002}. Thus, an IHSM's tamper detection subsystem will be able to clearly
|
||||||
|
distinguish attempts to stop the IHSM's rotation at an amplitude of $\SI{100}{g}$ from external accelerations. External
|
||||||
|
acceleration that would come close in order of magnitude to the operating centrifugal acceleration at the periphery of
|
||||||
|
an IHSM's rotor would likely destroy the IHSM.
|
||||||
|
|
||||||
|
\subsection{Transportation}
|
||||||
|
|
||||||
|
While unintentional acceleration is unlikely to cause false alarms in an IHSM when simple vibration damping is employed,
|
||||||
|
there is an issue with intentionally moving an IHSM: The IHSM's rotor stores significant rotational energy and will
|
||||||
|
respond to tipping with a precession force. This could become an issue when a larger IHSM is transported between e.g.\
|
||||||
|
the manufacturer's premises and its destination data center. One solution to this problem is to transport the IHSM
|
||||||
|
elastically mounted inside a shipping box that is weighted to resist precession forces. To reduce the amount of
|
||||||
|
precession, the IHSM should be transported with its axis of rotation pointing upwards and its speed of rotation set to
|
||||||
|
the lower end of the range permitted by its application's security requirements. The IHSM's software could allow for a
|
||||||
|
temporary ``shipping mode'' to be entered that could slow down the IHSM and increase the tamper sensing accelerometer's
|
||||||
|
thresholds.
|
||||||
|
|
||||||
|
During shipping, the IHSM will require a continuous power supply. The most practical solution to this challenge is to
|
||||||
|
ship the IHSM along with a small backup battery. Following our conservative estimate in Section~\ref{sec-power-failure},
|
||||||
|
a 48-hour shipping window as is offered by many courier shipping services could easily be bridged with the equivalent of
|
||||||
|
5-10 laptop batteries. In case a built-in battery backup is not necessary in the IHSM's application, these batteries
|
||||||
|
could be connected as an external device that is disconnected and sent back to the IHSM's manufacturer after the IHSM
|
||||||
|
has been installed.
|
||||||
|
|
||||||
\section{Attacks}
|
\section{Attacks}
|
||||||
\label{sec_attacks}
|
\label{sec_attacks}
|
||||||
|
|
||||||
|
|
|
||||||
Loading…
Add table
Add a link
Reference in a new issue