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@@ -4,193 +4,164 @@ <title>jaseg.de on Home</title> <link>http://jaseg.de/</link> <description>Recent content in jaseg.de on Home</description> - <generator>Hugo -- gohugo.io</generator> + <generator>Hugo</generator> <language>en-us</language> <copyright>Jan Sebastian Götte</copyright> - <lastBuildDate>Tue, 26 Dec 2023 15:26:00 +0100</lastBuildDate> + <lastBuildDate>Sun, 29 Jun 2025 23:42:00 +0100</lastBuildDate> <atom:link href="http://jaseg.de/index.xml" rel="self" type="application/rss+xml" /> <item> - <title>8seg</title> + <title>Getting the .ipynb Notebook File Location From a Running Jupyter Lab Notebook</title> + <link>http://jaseg.de/blog/jupyterlab-notebook-file-oneliner/</link> + <pubDate>Sun, 29 Jun 2025 23:42:00 +0100</pubDate> + <guid>http://jaseg.de/blog/jupyterlab-notebook-file-oneliner/</guid> + <description><div class="document">


<p>If you need to get the path of the ipynb file in a running #Jupyter notebook, this one-liner will do the trick. It seems chatgpt is confused, and a bunch of other approaches on the web look fragile and/or unnecessarily complex to me.</p>
</div></description> + </item> + <item> + <title>8seg Technical Overview</title> <link>http://jaseg.de/blog/8seg/</link> <pubDate>Tue, 26 Dec 2023 15:26:00 +0100</pubDate> <guid>http://jaseg.de/blog/8seg/</guid> - <description>8seg Technical Overview Prologue German hacker culture has this intense love for things that light up in colorful ways. Like for many others in this community, I have always been fascinated by LEDs. One of the first things on my pile of unfinished projects was to build my own LED matrix and use it to display text. When I started that project, I was still new to electronics. Back then, commercial LED matrices were limited to red or green color only, and were very expensive, so there was an incentive to build your own.</description> + <description><div class="document">


<p>8seg is a large-scale LED light art installation that displays text on a 1.5 meter high, 30 meter wide 8-segment display made from cheap LED tape.</p>
</div></description> </item> <item> <title>KiMesh</title> <link>http://jaseg.de/projects/kimesh/</link> <pubDate>Wed, 04 Oct 2023 23:42:00 +0200</pubDate> <guid>http://jaseg.de/projects/kimesh/</guid> - <description><div class="document"> - - -<p>KiMesh is a KiCad plugin that automatically creates security meshes with two or traces covering an arbitrarily-shaped outline on the board.</p> -</div></description> + <description><div class="document">


<p>KiMesh is a KiCad plugin that automatically creates security meshes with two or traces covering an arbitrarily-shaped outline on the board.</p>
</div></description> </item> <item> <title>Ubiquiti EdgeRouter on Deutsche Telekom GPON Fiber</title> <link>http://jaseg.de/blog/telekom-gpon-sfp/</link> <pubDate>Mon, 21 Feb 2022 20:00:00 +0100</pubDate> <guid>http://jaseg.de/blog/telekom-gpon-sfp/</guid> - <description>Disclaimer I provide this guide as a reference for other knowledgeable users without any warranty. Please feel free to use this as a resource but do not hold me responsible if this does not work for you. There is a significant chance that due to an error on my side or due to Telekom changing their setup this guide will not work for you, and you may end up having to pay for an unsuccessful Telekom technician visit.</description> + <description><div class="document">


<p>Short tutorial on getting a Deutsche Telekom GPON internet connection running using a SFP ONU unit in an Ubiquiti EdgeRouter.</p>
</div></description> </item> <item> <title>New Paper on Inertial Hardware Security Modules</title> <link>http://jaseg.de/blog/ihsm-worlds-first-diy-hsm/</link> <pubDate>Tue, 23 Nov 2021 23:42:20 +0100</pubDate> <guid>http://jaseg.de/blog/ihsm-worlds-first-diy-hsm/</guid> - <description>World's First DIY HSM Last week, Prof. Dr. Björn Scheuermann and I have published our first joint paper on Hardware Security Modules. In our paper, we introduce Inertial Hardware Security Modules (IHSMs), a new way of building high-security HSMs from basic components. I think the technology we demonstrate in our paper might allow some neat applications where some civil organization deploys a service that no one, not even they themselves, can snoop on.</description> + <description><div class="document">


<p>Paper announcement: We have published a paper on how you can DIY a tamper-sensing hardware security module from any single-board computer using a moving tamper-sensing mesh made from cheap PCBs.</p>
</div></description> </item> <item> <title>Kicad Mesh Plugin</title> <link>http://jaseg.de/blog/kicad-mesh-plugin/</link> <pubDate>Tue, 18 Aug 2020 13:15:39 +0200</pubDate> <guid>http://jaseg.de/blog/kicad-mesh-plugin/</guid> - <description>Tamper Detection Meshes Cryptography is at the foundation of our modern, networked world. From email to card payment infrastructure in brick and mortar stores, cryptographic keys secure almost every part of our digital lives againts cybercriminals or curious surveillance capitalists. Without cryptography, many of the things we routinely do in our lives such as paying for groceries with a credit card, messaging a friend on Signal or unlocking a car with its keyfob would not be possible.</description> + <description><div class="document">


<p>I wrote a little KiCad plugin that you can use to create security meshes, heaters and other things where you need one or more traces cover the entire surface of a PCB. The plugin supports arbitrary PCB shapes, cutouts, and can route around existing footprints and traces on the PCB.</p>
</div></description> </item> <item> <title>Private Contact Discovery</title> <link>http://jaseg.de/blog/private-contact-discovery/</link> <pubDate>Sat, 22 Jun 2019 10:30:00 +0800</pubDate> <guid>http://jaseg.de/blog/private-contact-discovery/</guid> - <description>Private Contact Discovery Private Contact Discovery (PCD) is the formal name for the problem modern smartphone messenger applications have on installation: Given a user's address book, find out which of their contacts also use the same messenger without the messenger's servers learning anything about the user's address book. The widespread non-private way to do this is to simply upload the user's address book to the app's operator's servers and do an SQL JOIN keyed on the phone number field against the database of registered users.</description> + <description><div class="document">


<p>I gave a short introduction into Private Contact Discovery protocols at our university workgroup.</p>
</div></description> </item> <item> <title>Hardware Security Module Basics</title> <link>http://jaseg.de/blog/hsm-basics/</link> <pubDate>Fri, 17 May 2019 15:29:20 +0800</pubDate> <guid>http://jaseg.de/blog/hsm-basics/</guid> - <description>Hardware Security Modules and Security Research and Cryptography On May 17 2019 I gave a short presentation on the fundamentals of hardware security modules at the weekly seminar of Prof. Mori's security research working group at Waseda University. The motivation for this was that outside of low-level hardware security people and people working in the financial industry HSMs are not thought about that often. In particular most network or systems security people would not consider them an option.</description> + <description><div class="document">


<p>I gave a short introduction into Hardware Security Modules at our university workgroup, including an overview on interesting research directions.</p>
</div></description> </item> <item> <title>How to talk to your microcontroller over serial</title> <link>http://jaseg.de/blog/serial-protocols/</link> <pubDate>Sat, 19 May 2018 08:09:46 +0200</pubDate> <guid>http://jaseg.de/blog/serial-protocols/</guid> - <description>Scroll to the end for the TL;DR. -In this article I will give an overview on the protocols spoken on serial ports, highlighting common pitfalls. I will summarize some points on how to design a serial protocol that is simple to implement and works reliably even under error conditions. -If you have done low-level microcontroller firmware you will regularly have had to stuff some data up a serial port to another microcontroller or to a computer.</description> + <description><div class="document">


<p>Scroll to the end for the <a class="reference internal" href="#conclusion">TL;DR</a>.</p>
<p>In this article I will give an overview on the protocols spoken on serial ports, highlighting common pitfalls. I will
summarize some points on how to design a serial protocol that is simple to implement and works reliably even under error
conditions.</p>
<p>If you have done low-level microcontroller firmware you will regularly have had to stuff some data up a serial port to
another microcontroller or to a computer. In the age of USB, an old-school serial port is still the simplest and
quickest way to get communication to a control computer up and running. Integrating a ten thousand-line USB stack into
your firmware and writing the necessary low-level drivers on the host side might take days. Poking a few registers to
set up your UART to talk to an external hardware USB to serial converter is a matter of minutes.</p></div></description> </item> <item> <title>Thor's Hammer</title> <link>http://jaseg.de/blog/thors-hammer/</link> <pubDate>Thu, 03 May 2018 11:59:37 +0200</pubDate> <guid>http://jaseg.de/blog/thors-hammer/</guid> - <description>In case you were having an inferiority complex because your friends' IBM Model M keyboards are so much louder than the shitty rubber dome freebie you got with your pc... Here's the solution: Thor's Hammer, a simple typing cadence enhancer for PS/2 keyboards. -Your browser does not support the HTML5 video tag. A demonstration of the completed project. h264 download / webm download The connects to the keyboard's PS/2 clock line and briefly actuates a large solenoid on each key press.</description> + <description><div class="document">


<p>In case you were having an inferiority complex because your friends' IBM Model M keyboards are so much louder than the
shitty rubber dome freebie you got with your pc... Here's the solution: Thor's Hammer, a simple typing cadence enhancer
for <a class="reference external" href="https://en.wikipedia.org/wiki/PS/2_port">PS/2</a> keyboards.</p>
<figure data-pagefind-ignore>
 <video controls loop>
 <source src="video/thors_hammer.mov" type="video/h264">
 <source src="video/thors_hammer.webm" type="video/webm">
 Your browser does not support the HTML5 video tag.
 </video>
 <figcaption>A demonstration of the completed project.

 <a href="video/thors_hammer.mov">h264 download</a> /
 <a href="video/thors_hammer.webm">webm download</a>
 </figcaption>
</figure><p>The connects to the keyboard's PS/2 clock line and briefly actuates a large solenoid on each key press. An interesting
fact about PS/2 is that the clock line is only active as long as either the host computer or the input device actually
want to send data. In case of a keyboard that's the case when a key is pressed or when the host changes the keyboard's
LED state, otherwise the clock line is silent. We ignore the LED activity for now as it's generally coupled to key
presses. By just triggering an NE555 configured as astable flipflop we can stretch each train of clock pulses to a
pulse a few tens of milliseconds long that is enough to actuate the solenoid.</p></div></description> </item> <item> <title>32-Channel LED tape driver</title> <link>http://jaseg.de/blog/multichannel-led-driver/</link> <pubDate>Wed, 02 May 2018 11:31:14 +0200</pubDate> <guid>http://jaseg.de/blog/multichannel-led-driver/</guid> - <description>Theoretical basics Together, a friend and I outfitted the small staircase at Berlin's Chaos Computer Club with nice, shiny RGB-WW LED tape for ambient lighting. This tape is like regular RGB tape but with an additional warm white channel, which makes for much more natural pastels and whites. There are several variants of RGBW tape. Cheap ones have separate RGB and white LEDs, which is fine for indirect lighting but does not work for direct lighting.</description> + <description><div class="document">


<p>Together, a friend and I outfitted the small staircase at Berlin's Chaos Computer Club with nice, shiny RGB-WW LED tape for ambient lighting. For this installation, I made a 32-channel LED driver that achieves high dynamic range on all 32 channels using a cheap microcontroller by using Binary Code Modulation.</p>
</div></description> </item> <item> <title>Wifi Led Driver</title> <link>http://jaseg.de/blog/wifi-led-driver/</link> <pubDate>Wed, 02 May 2018 11:31:03 +0200</pubDate> <guid>http://jaseg.de/blog/wifi-led-driver/</guid> - <description>Project motivation The completed driver board installed in the 3D-printed case. This device can now be connected to 12V and two segments of LED tape that can then be controlled trough Wifi. The ESP8266 module goes on the pin header on the left and was removed for this picture. After the multichannel LED driver was completed, I was just getting used to controlling LEDs at 14-bit resolution. I liked the board we designed in this project, but at 32 channels it was a bit large for most use cases.</description> + <description><div class="document">


<p>After the <a href="#system-message-1"><span class="problematic" id="problematic-1">`multichannel LED driver`_</span></a> was completed, I was just getting used to controlling LEDs at 14-bit resolution. I liked the board we designed in this project, but at 32 channels it was a bit large for most use cases. Sometimes I just want to pop a piece of LED tape or two somewhere, but I don't need a full 32 channels of control. I ended up thinking that a smaller version of the 32-channel driver that didn't require a separate control computer would be handy. So I sat down and designed a variant of the design with only 8 channels instead of 32 and an on-board <a href="#system-message-2"><span class="problematic" id="problematic-2">ESP8266_</span></a> module instead of the <a href="#system-message-3"><span class="problematic" id="problematic-3">RS485_</span></a> transceiver for WiFi connectivity.</p>
<div class="system-messages section">
<h2>Docutils System Messages</h2>
<div class="system-message" id="system-message-1">
<p class="system-message-title">System Message: ERROR/3 (<tt class="docutils">&lt;stdin&gt;</tt>, line 1); <em><a href="#problematic-1">backlink</a></em></p>
Unknown target name: &quot;multichannel led driver&quot;.</div>
<div class="system-message" id="system-message-2">
<p class="system-message-title">System Message: ERROR/3 (<tt class="docutils">&lt;stdin&gt;</tt>, line 1); <em><a href="#problematic-2">backlink</a></em></p>
Unknown target name: &quot;esp8266&quot;.</div>
<div class="system-message" id="system-message-3">
<p class="system-message-title">System Message: ERROR/3 (<tt class="docutils">&lt;stdin&gt;</tt>, line 1); <em><a href="#problematic-3">backlink</a></em></p>
Unknown target name: &quot;rs485&quot;.</div>
</div>
</div></description> </item> <item> <title>LED Characterization</title> <link>http://jaseg.de/blog/led-characterization/</link> <pubDate>Wed, 02 May 2018 11:18:38 +0200</pubDate> <guid>http://jaseg.de/blog/led-characterization/</guid> - <description>Preface Recently, I have been working on a small driver for ambient lighting using 12V LED strips like you can get inexpensively from China. I wanted to be able to just throw one of these somewhere, stick down some LED tape, hook it up to a small transformer and be able to control it through Wifi. When I was writing the firmware, I noticed that when fading between different colors, the colors look all wrong!</description> + <description><div class="document">


<div class="section" id="preface">
<h2>Preface</h2>
<p>Recently, I have been working on a <a class="reference external" href="http://jaseg.de/blog/wifi-led-driver/">small driver</a> for ambient lighting using 12V LED strips like you can get
inexpensively from China. I wanted to be able to just throw one of these somewhere, stick down some LED tape, hook it up
to a small transformer and be able to control it through Wifi. When I was writing the firmware, I noticed that when
fading between different colors, the colors look <em>all wrong</em>! This observation led me down a rabbit hole of color
perception and LED peculiarities.</p></div></description> </item> <item> <title>8seg</title> <link>http://jaseg.de/projects/8seg/</link> <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate> <guid>http://jaseg.de/projects/8seg/</guid> - <description><div class="document"> - - -<p>8seg is an experimental textual display. It is made from a 45m by 1.5m large lacework banner that can be put up in a variety of spaces, conforming to the space's size and shape through bending and folding.</p> -</div></description> + <description><div class="document">


<p>8seg is an experimental textual display. It is made from a 45m by 1.5m large lacework banner that can be put up in a variety of spaces, conforming to the space's size and shape through bending and folding.</p>
</div></description> </item> <item> <title>About jaseg</title> <link>http://jaseg.de/about/</link> <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate> <guid>http://jaseg.de/about/</guid> - <description>About Hej, I'm Jan, or jaseg. At the moment I'm doing a PhD (Dr.-Ing.) at TU Darmstadt in Computer Science, specializing on Hardware Security. This is my personal website where I publish things that I find interesting. -I self-host my code at git.jaseg.de, but I am also on github and on gitlab. I use github for issue tracking for some of my projects such as gerbolyze and python-mpv. I maintain the python-mpv and gerbolyze python packages on PyPI.</description> + <description><div class="document">


<div class="section" id="about">
<h2>About</h2>
<p>Hej, I'm Jan, or jaseg. At the moment I'm doing a PhD (Dr.-Ing.) at TU Darmstadt in Computer Science, specializing on
Hardware Security. This is my personal website where I publish things that I find interesting.</p>
<p>I self-host my code at <a class="reference external" href="https://git.jaseg.de/">git.jaseg.de</a>, but I am also on <a class="reference external" href="https://github.com/jaseg">github</a>
and on <a class="reference external" href="https://gitlab.com/neinseg">gitlab</a>. I use github for issue tracking for some of my projects such as
<a class="reference external" href="https://github.com/jaseg/gerbolyze">gerbolyze</a> and <a class="reference external" href="https://github.com/jaseg/python-mpv">python-mpv</a>. I maintain
the <a class="reference external" href="https://pypi.org/project/python-mpv/">python-mpv</a> and <a class="reference external" href="https://pypi.org/project/gerbolyze/">gerbolyze</a> python
packages on PyPI. Release tags on these two repositories are signed with the release signing key found <a class="reference external" href="https://github.com/jaseg.gpg">on github</a> and below.</p></div></description> </item> <item> <title>Gerbolyze</title> <link>http://jaseg.de/projects/gerbolyze/</link> <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate> <guid>http://jaseg.de/projects/gerbolyze/</guid> - <description><div class="document"> - - -<p>Gerbolyze is a tool that allows the modification of Gerber PCB artwork with a vector graphics editor like Inkscape. Gerbolyze directly converts between SVG and Gerber, and accurately reproduces details that other tools can not.</p> -</div></description> + <description><div class="document">


<p>Gerbolyze is a tool that allows the modification of Gerber PCB artwork with a vector graphics editor like Inkscape. Gerbolyze directly converts between SVG and Gerber, and accurately reproduces details that other tools can not.</p>
</div></description> </item> <item> <title>Gerbonara</title> <link>http://jaseg.de/projects/gerbonara/</link> <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate> <guid>http://jaseg.de/projects/gerbonara/</guid> - <description><div class="document"> - - -<p>Gerbonara is a user-friendly, powerful tool for reading, writing, modification and rendering of Gerber PCB artwork from the command line or from Python code. Gerbonara supports the Gerber dialects of all industry-standard EDA tools.</p> -</div></description> + <description><div class="document">


<p>Gerbonara is a user-friendly, powerful tool for reading, writing, modification and rendering of Gerber PCB artwork from the command line or from Python code. Gerbonara supports the Gerber dialects of all industry-standard EDA tools.</p>
</div></description> </item> <item> <title>Impressum</title> <link>http://jaseg.de/imprint/</link> <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate> <guid>http://jaseg.de/imprint/</guid> - <description>Impressum Sebastian Götte c/o Praxis Dr. Götte Krankenhausstr. 1a 54634 Bitburg imprint@jaseg.net Inhaltlich Verantwortlicher gem. § 55 II RStV: Sebastian Götte (Anschrift s.o.) Lizenz dieser Seite Dieses Werk ist lizenziert unter einer Creative Commons Namensnennung - Nicht-kommerziell - Weitergabe unter gleichen Bedingungen 4.0 International Lizenz (CC-BY-NC-SA) . Haftungsbeschränkung für Inhalte der Website Gemäß § 7 Abs. 1 TMG ist der Verantwortliche der Website i. S. v. § 5 TMG für eigene Informationen, die er zur Nutzung bereithält, nach den allgemeinen Gesetzen verantwortlich.</description> + <description><div class="document">


<div class="section" id="impressum">
<h2>Impressum</h2>
<p>
Sebastian Götte<br/>
c/o Praxis Dr. Götte<br/>
Krankenhausstr. 1a<br/>
54634 Bitburg<br/>
imprint@jaseg.net
</p>

Inhaltlich Verantwortlicher gem. § 55 II RStV: Sebastian Götte (Anschrift s.o.)</div>
<div class="section" id="lizenz-dieser-seite">
<h2>Lizenz dieser Seite</h2>
Dieses Werk ist lizenziert unter einer
<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">
 Creative Commons Namensnennung - Nicht-kommerziell - Weitergabe unter gleichen Bedingungen 4.0 International
 Lizenz (CC-BY-NC-SA)
</a>.<br/>
<a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">
 <img alt="Creative Commons Lizenzvertrag" style="border-width:0"
 src="https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png" data-pagefind-ignore/>
</a></div>
<div class="section" id="haftungsbeschrankung-fur-inhalte-der-website">
<h2>Haftungsbeschränkung für Inhalte der Website</h2>
<p>Gemäß § 7 Abs. 1 TMG ist der Verantwortliche der Website i. S. v. § 5 TMG für eigene Informationen, die er zur Nutzung
bereithält, nach den allgemeinen Gesetzen verantwortlich.</p></div></description> </item> <item> <title>lolcat-c</title> <link>http://jaseg.de/projects/lolcat-c/</link> <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate> <guid>http://jaseg.de/projects/lolcat-c/</guid> - <description><div class="document"> - - -<p>lolcat-c is a small, high-performance re-implementation of the <a class="reference external" href="https://github.com/busyloop/lolcat">lolcat</a> rainbow cat utility. lolcat-c is meant as a lolcat that you can actually use in production. It is fast, not slowing down whatever you pipe through it, and it robustly handles real-world terminal output including escape sequences.</p> -</div></description> + <description><div class="document">


<p>lolcat-c is a small, high-performance re-implementation of the <a class="reference external" href="https://github.com/busyloop/lolcat">lolcat</a> rainbow cat utility. lolcat-c is meant as a lolcat that you can actually use in production. It is fast, not slowing down whatever you pipe through it, and it robustly handles real-world terminal output including escape sequences.</p>
</div></description> </item> <item> <title>python-mpv</title> <link>http://jaseg.de/projects/python-mpv/</link> <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate> <guid>http://jaseg.de/projects/python-mpv/</guid> - <description><div class="document"> - - -<p>python-mpv is a small, ctypes-based Python library wrapping the libmpv media player library. Despite its small size and simple API, python-mpv allows advanced control over libmpv and beyond simple remote control of mpv can be used to embed mpv in OpenGL, Qt, and GTK-based Python applications.</p> -</div></description> + <description><div class="document">


<p>python-mpv is a small, ctypes-based Python library wrapping the libmpv media player library. Despite its small size and simple API, python-mpv allows advanced control over libmpv and beyond simple remote control of mpv can be used to embed mpv in OpenGL, Qt, and GTK-based Python applications.</p>
</div></description> </item> <item> <title>svg-flatten</title> <link>http://jaseg.de/projects/svg-flatten/</link> <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate> <guid>http://jaseg.de/projects/svg-flatten/</guid> - <description><div class="document"> - - -<p>svg-flatten is a command-line utility that performs vector occlusion and clipping on SVG files, producing a flattened SVG file without overlapping elements, without changing what the file looks like. svg-flatten is used as a part of gerbolyze.</p> -</div></description> + <description><div class="document">


<p>svg-flatten is a command-line utility that performs vector occlusion and clipping on SVG files, producing a flattened SVG file without overlapping elements, without changing what the file looks like. svg-flatten is used as a part of gerbolyze.</p>
</div></description> </item> <item> <title>wsdiff</title> <link>http://jaseg.de/projects/wsdiff/</link> <pubDate>Mon, 01 Jan 0001 00:00:00 +0000</pubDate> <guid>http://jaseg.de/projects/wsdiff/</guid> - <description><div class="document"> - - -<p>wsdiff is a command-line utility that produces self-contained, syntax-highlighted, HTML-formatted diffs that support both unified and side-by-side diffs from a single source file using nothing but CSS magic.</p> -</div></description> + <description><div class="document">


<p>wsdiff is a command-line utility that produces self-contained, syntax-highlighted, HTML-formatted diffs that support both unified and side-by-side diffs from a single source file using nothing but CSS magic.</p>
</div></description> </item> </channel> </rss> |