<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"><head><!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><body><div style="color:#000; background-color:#fff; font-family:lucida console, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1480795362277_13945">Well, so we could put together and sell an anti-anti-computer-dongle-dongle.  Sounds like a good idea.</div><div id="yui_3_16_0_ym19_1_1480795362277_14812"><br></div><div id="yui_3_16_0_ym19_1_1480795362277_14741" dir="ltr">James<br></div><div id="yui_3_16_0_ym19_1_1480795362277_14309" dir="ltr"><br></div><div id="yui_3_16_0_ym19_1_1480795362277_14742" dir="ltr"><br></div><div class="qtdSeparateBR"><br><br></div><div style="display: block;" id="yui_3_16_0_ym19_1_1480795362277_14746" class="yahoo_quoted">  <div id="yui_3_16_0_ym19_1_1480795362277_14745" style="font-family: lucida console, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1480795362277_14744" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_ym19_1_1480795362277_14743" dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Michael Robinson <elvagante@gmail.com><br> <b><span style="font-weight: bold;">To:</span></b> Hack Manhattan! <blabber@list.hackmanhattan.com> <br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, December 3, 2016 6:24 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [Blabber] Killer USB stick<br> </font> </div> <div id="yui_3_16_0_ym19_1_1480795362277_14867" class="y_msg_container"><br><div id="yiv5237787507"><div id="yui_3_16_0_ym19_1_1480795362277_14873"><div>Crowbar:  series fuse and a shunt clamp. I can only think that a fuse has negligible effect on bandwidth.  There are commercially available crowbar chips for protecting telecommunications equipment from lightning surges, I googled it.  Maybe not small and cheap enough for USB ports, but that's not to say you couldn't produce such a thing.</div><div id="yui_3_16_0_ym19_1_1480795362277_14872" class="yiv5237787507gmail_extra"><br clear="none"><div id="yui_3_16_0_ym19_1_1480795362277_14871" class="yiv5237787507gmail_quote">On Dec 3, 2016 1:36 PM, "Guan Yang" <<a rel="nofollow" shape="rect" ymailto="mailto:guan@hackmanhattan.com" target="_blank" href="mailto:guan@hackmanhattan.com">guan@hackmanhattan.com</a>> wrote:<br clear="none"><blockquote id="yui_3_16_0_ym19_1_1480795362277_14870" class="yiv5237787507gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="yiv5237787507yqt7449214880" id="yiv5237787507yqt05586"><div id="yui_3_16_0_ym19_1_1480795362277_14869"><div></div><div id="yui_3_16_0_ym19_1_1480795362277_14868">There are integrated isolators available for USB. Some are based on giant magnetoresistance, but there are other methods too, like the good old transformer.</div><div><br clear="none"></div><div id="yui_3_16_0_ym19_1_1480795362277_14877">Here's one for full speed:</div><div id="yui_3_16_0_ym19_1_1480795362277_14876"><br clear="none"></div><div id="yui_3_16_0_ym19_1_1480795362277_14875"><a id="yui_3_16_0_ym19_1_1480795362277_14874" rel="nofollow" shape="rect" target="_blank" href="http://cds.linear.com/docs/en/datasheet/2884fb.pdf">http://cds.linear.com/docs/en/ datasheet/2884fb.pdf</a></div><div><br clear="none"></div><div>I couldn't find any integrated solutions for high speed, but I think it's possible. Gigabit Ethernet is (magnetically) isolated so you can always serialize through that. Or you can go through a set of fiberoptic transceivers.</div><div><br clear="none"></div><div>Here's an overview of various techniques:</div><div id="yui_3_16_0_ym19_1_1480795362277_14878"><br clear="none"></div><div><a rel="nofollow" shape="rect" target="_blank" href="http://www.digikey.com/en/articles/techzone/2015/aug/digital-isolation-devices-find-pervasive-role-in-energy-harvesting-applications">http://www.digikey.com/en/ articles/techzone/2015/aug/ digital-isolation-devices- find-pervasive-role-in-energy- harvesting-applications</a></div><div id="yui_3_16_0_ym19_1_1480795362277_14879"><br clear="none">On Dec 3, 2016, at 13:11, Michael Robinson <<a rel="nofollow" shape="rect" ymailto="mailto:elvagante@gmail.com" target="_blank" href="mailto:elvagante@gmail.com">elvagante@gmail.com</a>> wrote:<br clear="none"><br clear="none"></div><blockquote id="yui_3_16_0_ym19_1_1480795362277_14882" type="cite"><div id="yui_3_16_0_ym19_1_1480795362277_14881"><span id="yui_3_16_0_ym19_1_1480795362277_14880">The writer suggests opto-isolators to protect against killer usb.</span><br clear="none"><span>Not.</span><br clear="none"><span>Opto-isolators are slooooooow.  Like a few tens of kilohertz bandwidth at most.</span><br clear="none"><span>Crowbar circuit, anyone?</span><br clear="none"><span></span><br clear="none"><span>On Sat, Dec 3, 2016 at 12:48 AM, Peter S. Shenkin <<a rel="nofollow" shape="rect" ymailto="mailto:shenkin@gmail.com" target="_blank" href="mailto:shenkin@gmail.com">shenkin@gmail.com</a>> wrote:</span><br clear="none"><blockquote type="cite"><span>Sounds like a good Maker Faire project.   ;-)</span><br clear="none"></blockquote><blockquote type="cite"><span></span><br clear="none"></blockquote><blockquote type="cite"><span><a rel="nofollow" shape="rect" target="_blank" href="http://arstechnica.com/gadgets/2016/12/usb-killer-fries-devices/">http://arstechnica.com/ gadgets/2016/12/usb-killer- fries-devices/</a></span><br clear="none"></blockquote><blockquote type="cite"><span></span><br clear="none"></blockquote><blockquote type="cite"><span>______________________________ _________________</span><br clear="none"></blockquote><blockquote type="cite"><span>Blabber mailing list <a rel="nofollow" shape="rect" ymailto="mailto:Blabber@list.hackmanhattan.com" target="_blank" href="mailto:Blabber@list.hackmanhattan.com">Blabber@list.hackmanhattan.com</a></span><br clear="none"></blockquote><blockquote type="cite"><span><a rel="nofollow" shape="rect" target="_blank" href="https://list.hackmanhattan.com/listinfo/blabber">https://list.hackmanhattan. com/listinfo/blabber</a></span><br clear="none"></blockquote><span>______________________________ _________________</span><br clear="none"><span>Blabber mailing list <a rel="nofollow" shape="rect" ymailto="mailto:Blabber@list.hackmanhattan.com" target="_blank" href="mailto:Blabber@list.hackmanhattan.com">Blabber@list.hackmanhattan.com</a></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" href="https://list.hackmanhattan.com/listinfo/blabber">https://list.hackmanhattan. com/listinfo/blabber</a></span></div></blockquote></div></div><br clear="none">______________________________ _________________<br clear="none">
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