CRoCS wiki - public:openlabCentre for Research on Cryptography and Security
https://crocs.fi.muni.cz/
2026-10-15T01:48:59+00:00CRoCS wiki
https://crocs.fi.muni.cz/
https://crocs.fi.muni.cz/_media/wiki/logo.pngtext/html2017-04-21T09:55:25+00:00Anonymous (anonymous@undisclosed.example.com)OpenLab 2014/07 | Hands on 3D Printing
https://crocs.fi.muni.cz/public/openlab/3dprint
<h1 class="sectionedit1" id="openlab_201407_hands_on_3d_printing">OpenLab 2014/07 | Hands on 3D Printing</h1>
<div class="level1">
<ul>
<li class="level1"><div class="li"> Date: 21. 4. 2017</div>
</li>
<li class="level1"><div class="li"> Workshop by: Lukáš Němec</div>
</li>
<li class="level1"><div class="li"> Cake: we will see…</div>
</li>
</ul>
<p>
This page will mostly be a collection of links organised by the usual workflow.
</p>
</div>
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<h2 class="sectionedit2" id="hardware">Hardware</h2>
<div class="level2">
<ul>
<li class="level1"><div class="li"> Buy prints: <a href="https://www.shapeways.com" class="urlextern" target="_blank" title="https://www.shapeways.com" rel="ugc nofollow noopener">https://www.shapeways.com</a>, <a href="https://www.3dhubs.com" class="urlextern" target="_blank" title="https://www.3dhubs.com" rel="ugc nofollow noopener">https://www.3dhubs.com</a></div>
</li>
<li class="level1"><div class="li"> Buy printer time: <a href="https://www.fablabbrno.cz" class="urlextern" target="_blank" title="https://www.fablabbrno.cz" rel="ugc nofollow noopener">https://www.fablabbrno.cz</a>, <a href="http://agdm.fi.muni.cz" class="urlextern" target="_blank" title="http://agdm.fi.muni.cz" rel="ugc nofollow noopener">http://agdm.fi.muni.cz</a></div>
</li>
<li class="level1"><div class="li"> Buy printer / printer kit (see reviews section below)</div>
</li>
<li class="level1"><div class="li"> Build one from scratch: <a href="https://toms3d.org/2017/02/23/building-cheapest-possible-prusa-i3-mk2/" class="urlextern" target="_blank" title="https://toms3d.org/2017/02/23/building-cheapest-possible-prusa-i3-mk2/" rel="ugc nofollow noopener">https://toms3d.org/2017/02/23/building-cheapest-possible-prusa-i3-mk2/</a></div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"Hardware","hid":"hardware","codeblockOffset":0,"secid":2,"range":"216-532"} -->
<h3 class="sectionedit3" id="reviews_tips_etc">Reviews, tips, etc.</h3>
<div class="level3">
<ul>
<li class="level1"><div class="li"> <a href="http://makezine.com/comparison/3dprinters/" class="urlextern" target="_blank" title="http://makezine.com/comparison/3dprinters/" rel="ugc nofollow noopener">http://makezine.com/comparison/3dprinters/</a></div>
</li>
<li class="level1"><div class="li"> <a href="http://www.tested.com/tech/3d-printing" class="urlextern" target="_blank" title="http://www.tested.com/tech/3d-printing" rel="ugc nofollow noopener">http://www.tested.com/tech/3d-printing</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://twitter.com/cworthdynamics" class="urlextern" target="_blank" title="https://twitter.com/cworthdynamics" rel="ugc nofollow noopener">https://twitter.com/cworthdynamics</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://twitter.com/joeltelling" class="urlextern" target="_blank" title="https://twitter.com/joeltelling" rel="ugc nofollow noopener">https://twitter.com/joeltelling</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://twitter.com/Barnacules" class="urlextern" target="_blank" title="https://twitter.com/Barnacules" rel="ugc nofollow noopener">https://twitter.com/Barnacules</a></div>
</li>
</ul>
</div>
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<h2 class="sectionedit4" id="get_model_-_stl_file">Get Model - .stl file</h2>
<div class="level2">
<ul>
<li class="level1"><div class="li"> Download: <a href="http://www.thingiverse.com" class="urlextern" target="_blank" title="http://www.thingiverse.com" rel="ugc nofollow noopener">http://www.thingiverse.com</a>, <a href="https://i.materialise.com/blog/3d-model-databases/" class="urlextern" target="_blank" title="https://i.materialise.com/blog/3d-model-databases/" rel="ugc nofollow noopener">https://i.materialise.com/blog/3d-model-databases/</a></div>
</li>
<li class="level1"><div class="li"> Create: Any 3D modelling tool (Fusion 360, Sketchup, Blender …)</div>
</li>
<li class="level1"><div class="li"> Download your own design: <a href="http://www.cookiecaster.com" class="urlextern" target="_blank" title="http://www.cookiecaster.com" rel="ugc nofollow noopener">http://www.cookiecaster.com</a>, <a href="http://www.thingiverse.com/customizable" class="urlextern" target="_blank" title="http://www.thingiverse.com/customizable" rel="ugc nofollow noopener">http://www.thingiverse.com/customizable</a></div>
</li>
</ul>
</div>
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<h2 class="sectionedit5" id="slice_the_model_-_gcode_file">Slice the model - .gcode file</h2>
<div class="level2">
<p>
Instructions for the printer, if possible, get slicer with dialed up settings for your printer
</p>
<ul>
<li class="level1"><div class="li"> <a href="http://slic3r.org" class="urlextern" target="_blank" title="http://slic3r.org" rel="ugc nofollow noopener">http://slic3r.org</a> or alternatively <a href="http://www.prusa3d.com/drivers/" class="urlextern" target="_blank" title="http://www.prusa3d.com/drivers/" rel="ugc nofollow noopener">http://www.prusa3d.com/drivers/</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://ultimaker.com/en/products/cura-software" class="urlextern" target="_blank" title="https://ultimaker.com/en/products/cura-software" rel="ugc nofollow noopener">https://ultimaker.com/en/products/cura-software</a></div>
</li>
<li class="level1"><div class="li"> <a href="http://www.kisslicer.com" class="urlextern" target="_blank" title="http://www.kisslicer.com" rel="ugc nofollow noopener">http://www.kisslicer.com</a></div>
</li>
</ul>
</div>
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<h2 class="sectionedit6" id="print_it">Print it</h2>
<div class="level2">
<p>
Takes quite a lot of time unfortunately
</p>
</div>
<!-- EDIT{"target":"section","name":"Print it","hid":"print_it","codeblockOffset":0,"secid":6,"range":"1353-1414"} -->
<h2 class="sectionedit7" id="finish_it">Finish it</h2>
<div class="level2">
<ul>
<li class="level1"><div class="li"> sand </div>
</li>
<li class="level1"><div class="li"> prime</div>
</li>
<li class="level1"><div class="li"> paint</div>
</li>
<li class="level1"><div class="li"> assemble</div>
</li>
</ul>
<p>
<a href="https://www.youtube.com/playlist?list=PL6q0fd3ileWIboa461ciqM_yKlm5WIu5B" class="urlextern" target="_blank" title="https://www.youtube.com/playlist?list=PL6q0fd3ileWIboa461ciqM_yKlm5WIu5B" rel="ugc nofollow noopener">https://www.youtube.com/playlist?list=PL6q0fd3ileWIboa461ciqM_yKlm5WIu5B</a>
<a href="https://youtu.be/hZOg5RLjaFI" class="urlextern" target="_blank" title="https://youtu.be/hZOg5RLjaFI" rel="ugc nofollow noopener">https://youtu.be/hZOg5RLjaFI</a>
<a href="https://youtu.be/kCmJen4Fm-Q" class="urlextern" target="_blank" title="https://youtu.be/kCmJen4Fm-Q" rel="ugc nofollow noopener">https://youtu.be/kCmJen4Fm-Q</a>
</p>
</div>
<!-- EDIT{"target":"section","name":"Finish it","hid":"finish_it","codeblockOffset":0,"secid":7,"range":"1415-"} -->text/html2016-12-01T13:28:29+00:00Anonymous (anonymous@undisclosed.example.com)CPU BIOS optimizations
https://crocs.fi.muni.cz/public/openlab/cpubiosoptim
<h1 class="sectionedit1" id="cpu_bios_optimizations">CPU BIOS optimizations</h1>
<div class="level1">
<pre class="code">Ahojte,
v navaznosti na jeden ze starsich OpenLabu, kde jste nanaseli pastu na
procesor jsem ted narazil na zajimavy clanek (a 2 videa: a. jak to
nedelat [oficialne reklamni MSI video]; b. na video porovnavajici ruzne
pristupy nanaseni termopast).
Vice zde:
http://diit.cz/clanek/jak-nanaset-pastu-na-procesor
V navaznosti na patecni tema. Rozhodne, optimalizace v kodu jsou super a
dobra a dulezita vec. Ale z jineho soudku.
V posledni dobe, kdy se vsichni zenou za usporou energie vsak ale
preklvapive mnohdy nedosahnete vykonu vami zakoupeneho procesoru,
protoze vas blokuji ruzne "usporne vychytavky" v defaultnim nastaveni
CPU/BIOSu (omezujici TDP atp.). Vhodna optimalizace nastaveni BIOSu vam
tedy take muze prinest drasticke navyseni vykonu. Z to zde nemluvim jen
o CPU -- napr pokud mate SSD disk a mate vypnuto AHCI, tak mate kolem
5000-10000IOPS, zatimco se zapnutym AHCI Vam to vyskoci na 60000-80000
IOPS na disk.
Dle meho pozorovani nejnovejsi technologie uspory energie - thermal
power management (kdy procesor na zaklade vykonu a spotreby omezuje
vykon) je jednou z veci, ktera drasticky omezuje vykon. Viz moznosti v
BIOSu na obrazku TDP.jpg. Intel razi posledni dobu strategii uvadet u
nekterych procesoru nizkou zakladni frekvenci (napt. 1.7GHz), ale pritom
moznost dosahnout v turbo napr. 3.3 GHz. To plati zejmena pro
ultra-low-power consumption procesory. Po par experimentech vsak lze
snadno zjistit, ze vam pri rovnomernem vytizeni vsech 4 jader stoupne
frekvence napr na 2.9GHz, a po cca 50-100s spadne nekde na 2.2GHz (i
kdyz je vse precizne chlazeno). Coz je ubytek 1/3 vykonu.
Mnohe diskuze na toto tema se tvari tak, ze je to vlastnost tech
procesoru (a ze je to normalni). Nicmene uz po par experimentech s
nastavovanim TDP a cTDP lze zjistit, ze je to vse v nastaveni BIOSu
(pokud to BIOS umoznuje). Da se pak prenastavenim snadno dosahnout, aby
pri normalnim/rozumnem chlazeni jely napr. vsechna 4 jadra na 2.9GHz a
nespadlo to po minute na 2.2GHz ci nize. To neni samozrejme v rozporu s
nazory v diskuzich -- vsechna 4 jadra dostat na 3.3GHZ procesor pri
plnem vytizeni nedovoli. Na druhou stranu, zlepsit defaultni chovani
mnohdy lze. Samozrejme, utrpi pak spotreba, ale...
V nekterych novych BIOSech zase treba Intel zase uvadi ruzne nove
vychytavky jako Streamer Prefetch a Spatial Prefetch, coz nemusi byt
take spatne na prozkoumani (kdy to mit zaple, kdy ne atp.) Sam jsem to
zatim moc nestudoval (viz prefetch.jpg).
Nemuselo by byt spatne vice experimentalne oblast novych BIOSu a
procesoru. Je to dost casove narocne, biosy jsou spatne dokumentovane,
navic u rychlosti CPU a disku se to snadno meri -- a v BIOSu lze
ovlivnit dalsi desitky veci (interrupts, PCIe sbernice, interni GPU
atp.) ktere uz jsou hure zmeritelne. Navic ruzne BIOSy maji ruzne
moznosti, a ruzne procesory take. Dobra nastaveni Vam vsak mohou prinest
dost vykonu navic (a toz de nemluvim o pretaktovavani -- to je zcela
jina "hra").
Necekam, ze se do toho nekdo pusti, ale spise, kdyby jste nekdy nekdo
takto s BIOSy experimentovali, tak se klidne podelte o zkusenosti jak
navysit vykon. Me posledni dobou dost prekvapilo, jake moznosti tam jsou
(ale mluvim zde spis o desktopovych BIOSech, ne o osekanych BIOSech na
laptopech).
Mejte se,
H. Krhovjak</pre>
<p>
<a href="https://crocs.fi.muni.cz/_detail/public/openlab/prefetch.jpg?id=public%3Aopenlab%3Acpubiosoptim" class="media" target="_blank" title="public:openlab:prefetch.jpg" rel="noopener"><img src="https://crocs.fi.muni.cz/_media/public/openlab/prefetch.jpg?w=300&tok=4f5414" class="media" loading="lazy" alt="" width="300" /></a>
<a href="https://crocs.fi.muni.cz/_detail/public/openlab/tdp.jpg?id=public%3Aopenlab%3Acpubiosoptim" class="media" target="_blank" title="public:openlab:tdp.jpg" rel="noopener"><img src="https://crocs.fi.muni.cz/_media/public/openlab/tdp.jpg?w=300&tok=f0dede" class="media" loading="lazy" alt="" width="300" /></a>
</p>
</div>
text/html2020-10-07T08:27:05+00:00Anonymous (anonymous@undisclosed.example.com)OpenLab
https://crocs.fi.muni.cz/public/openlab/main
<p>
<img src="https://crocs.fi.muni.cz/_media/public/crocs/crocs_banner_v2.png?w=900&tok=fb29fd" class="media" loading="lazy" alt="" width="900" />
</p>
<h2 class="sectionedit1" id="openlab">OpenLab</h2>
<div class="level2">
<p>
OpenLab was an informal meeting of students interested in security and cryptography that used to take place <strong>each Friday 09:00-10:00 in A403</strong>.
</p>
</div>
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<h2 class="sectionedit2" id="openlab_wiki">OpenLab wiki</h2>
<div class="level2">
<ul>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/research/main" class="wikilink1" title="public:research:main" data-wiki-id="public:research:main">Research projects at CRoCS</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/_media/public/crocs/crocs_cake_poster.pdf" class="media mediafile mf_pdf" target="_blank" title="public:crocs:crocs_cake_poster.pdf (1.3 MB)" rel="noopener">OpenLab poster</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/openlab/plans" class="wikilink1" title="public:openlab:plans" data-wiki-id="public:openlab:plans">Potential future OpenLab sessions</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/openlab/autumn2014/wallpainting" class="wikilink1" title="public:openlab:autumn2014:wallpainting" data-wiki-id="public:openlab:autumn2014:wallpainting">Decorating the classroom (A403)</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/openlab/main" class="wikilink1" title="openlab:main" data-wiki-id="openlab:main">Notes, brainstorming (internal)</a></div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"OpenLab wiki","hid":"openlab_wiki","codeblockOffset":0,"secid":2,"range":"230-566"} -->
<h2 class="sectionedit3" id="next_event_s">Next event(s)</h2>
<div class="level2">
<p>
None planned
</p>
</div>
<!-- EDIT{"target":"section","name":"Next event(s)","hid":"next_event_s","codeblockOffset":0,"secid":3,"range":"567-610"} -->
<h2 class="sectionedit4" id="previous_events">Previous events</h2>
<div class="level2">
<ul>
<li class="level1"><div class="li"> 14.12.2018 Creativity & Innovation (Lydia K.)</div>
</li>
<li class="level1"><div class="li"> 07.12.2018 User action detection from encrypted network traffic (Jaroslav S., Nexa Technologies CZ)</div>
</li>
<li class="level1"><div class="li"> 23.11.2018 Side channel secure implementations, constant-time algorithms in Python, Chacha20 example (Hubert Kario, RedHat)</div>
</li>
<li class="level1"><div class="li"> 09.11.2018 <a href="https://crocs.fi.muni.cz/public/openlab/raspi" class="wikilink1" title="public:openlab:raspi" data-wiki-id="public:openlab:raspi">RaspberryPi</a> hands-on, mesh network (Lukas N.)</div>
</li>
<li class="level1"><div class="li"> 02.11.2018 Usable security or usable authentication (Lydia K.)</div>
</li>
<li class="level1"><div class="li"> 26.10.2018 JavaCard open-source ecosystem, (Petr S.)</div>
</li>
<li class="level1"><div class="li"> 19.10.2018 Africa trip report (Radka C.)</div>
</li>
<li class="level1"><div class="li"> 21.09.2018 Open thesis topics in CRoCS lab, <a href="https://crocs.fi.muni.cz/_media/public/openlab/openlab_crocsthemes_20180921.pdf" class="media mediafile mf_pdf" target="_blank" title="public:openlab:openlab_crocsthemes_20180921.pdf (2.8 MB)" rel="noopener"> slides</a> <em>[event by all, cake by Syso]</em></div>
</li>
</ul>
<ul>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/openlab/spring2018/main" class="wikilink1" title="public:openlab:spring2018:main" data-wiki-id="public:openlab:spring2018:main"> Archive of events in Spring 2018</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/openlab/autumn2017/main" class="wikilink1" title="public:openlab:autumn2017:main" data-wiki-id="public:openlab:autumn2017:main"> Archive of events in Autumn 2017</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/openlab/spring2017/main" class="wikilink1" title="public:openlab:spring2017:main" data-wiki-id="public:openlab:spring2017:main"> Archive of events in Spring 2017</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/openlab/autumn2016/main" class="wikilink1" title="public:openlab:autumn2016:main" data-wiki-id="public:openlab:autumn2016:main"> Archive of events in Autumn 2016</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/openlab/spring2016/main" class="wikilink1" title="public:openlab:spring2016:main" data-wiki-id="public:openlab:spring2016:main"> Archive of events in Spring 2016</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/openlab/autumn2015/main" class="wikilink1" title="public:openlab:autumn2015:main" data-wiki-id="public:openlab:autumn2015:main"> Archive of events in Autumn 2015</a> </div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/openlab/spring2015/main" class="wikilink1" title="public:openlab:spring2015:main" data-wiki-id="public:openlab:spring2015:main"> Archive of events in Spring 2015</a> </div>
</li>
<li class="level1"><div class="li"> <a href="https://crocs.fi.muni.cz/public/openlab/autumn2014/main" class="wikilink1" title="public:openlab:autumn2014:main" data-wiki-id="public:openlab:autumn2014:main"> Archive of events in Autumn 2014</a></div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"Previous events","hid":"previous_events","codeblockOffset":0,"secid":4,"range":"611-1909"} -->
<h2 class="sectionedit5" id="photogallery">Photogallery</h2>
<div class="level2">
<p>
<a href="https://crocs.fi.muni.cz/_media/public/openlab/osint.jpg" class="media" target="_blank" title="public:openlab:osint.jpg" rel="noopener"><img src="https://crocs.fi.muni.cz/_media/public/openlab/osint.jpg?w=900&tok=554ec0" class="media" loading="lazy" alt="" width="900" /></a>
<a href="https://crocs.fi.muni.cz/_media/public/openlab/autumn2016/qcomp.jpg" class="media" target="_blank" title="public:openlab:autumn2016:qcomp.jpg" rel="noopener"><img src="https://crocs.fi.muni.cz/_media/public/openlab/autumn2016/qcomp.jpg?w=900&tok=072fe4" class="media" loading="lazy" alt="" width="900" /></a>
</p>
</div>
<!-- EDIT{"target":"section","name":"Photogallery","hid":"photogallery","codeblockOffset":0,"secid":5,"range":"1910-"} -->text/html2017-09-29T14:58:32+00:00Anonymous (anonymous@undisclosed.example.com)Potential future OpenLab sessions
https://crocs.fi.muni.cz/public/openlab/plans
<h1 class="sectionedit1" id="potential_future_openlab_sessions">Potential future OpenLab sessions</h1>
<div class="level1">
<p>
If you have an idea (including crazy ones), add a new bullet point to the list. You never know, what will come…
</p>
</div>
<!-- EDIT{"target":"section","name":"Potential future OpenLab sessions","hid":"potential_future_openlab_sessions","codeblockOffset":0,"secid":1,"range":"1-165"} -->
<h2 class="sectionedit2" id="proposed_and_unused_ideas">Proposed and unused ideas</h2>
<div class="level2">
<ul>
<li class="level1"><div class="li"> UAV flying again (Beda)</div>
</li>
<li class="level1"><div class="li"> Runnning</div>
</li>
<li class="level1"><div class="li"> “Quantum computing” reloaded? <a href="https://www.wired.com/2017/01/d-wave-turns-open-source-democratize-quantum-computing/" class="urlextern" target="_blank" title="https://www.wired.com/2017/01/d-wave-turns-open-source-democratize-quantum-computing/" rel="ugc nofollow noopener">https://www.wired.com/2017/01/d-wave-turns-open-source-democratize-quantum-computing/</a></div>
</li>
<li class="level1"><div class="li"> MetaCentrum</div>
</li>
<li class="level1"><div class="li"> Travis Coverity (other tools?)</div>
</li>
<li class="level1"><div class="li"> Geeky radio</div>
</li>
<li class="level1"><div class="li"> U/UTP crimping</div>
</li>
<li class="level1"><div class="li"> Arduino</div>
</li>
<li class="level1"><div class="li"> CRoCS research overview</div>
</li>
<li class="level1"><div class="li"> Key-generating party</div>
</li>
<li class="level1"><div class="li"> crypto acceleration (optimization) for networking</div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"Proposed and unused ideas","hid":"proposed_and_unused_ideas","codeblockOffset":0,"secid":2,"range":"166-571"} -->
<h3 class="sectionedit3" id="inside_lab_a403">Inside Lab (A403)</h3>
<div class="level3">
<ul>
<li class="level1"><div class="li"> <strong>Dancing session</strong></div>
</li>
<li class="level1"><div class="li"> <strong>Cold boot demo</strong> <br/>
Having liquid Nitrogen, Computer with TrueCrypt key in RAM, cooling the RAM, “transplanting” it and reading the keys out… </div>
</li>
<li class="level1"><div class="li"> <strong>Security protocol verification</strong><br/>
Intro to verifying protocols by Martin. Most likely demo of ProVerif, hands-on exercise. </div>
</li>
<li class="level1"><div class="li"> <strong>Qt library</strong><br/>
How to use Qt library, what it offers. Hands-on demo/tasks. (Karel?, Mirek?, Michal?)</div>
</li>
<li class="level1"><div class="li"> <strong>USB firmware viruses</strong><br/>
Why we should consider every randomly found USB as infected. (Strho?)</div>
</li>
<li class="level1"><div class="li"> <strong>HDD firmware viruses</strong><br/>
viruses on HDDs in service tracks, outliving formatting, … (Milan Broz)</div>
</li>
<li class="level1"><div class="li"> <strong>Quadcopter</strong><br/>
Talks about what it takes to fly your own Quadcopter. Perhaps a demo? (Martin Stehlik?)</div>
</li>
<li class="level1"><div class="li"> <strong>Coverity scan</strong><br/>
Coverity online scan. Compilation, interface, combination with GitHub and TravisCI. Hands-on workshop (problem: authenticating the coverity account takes time. How much?) (Petr? Martin?)</div>
</li>
<li class="level1"><div class="li"> <strong>MetaCentrum computing</strong><br/>
How to compute on MetaCentrum clusters. Ideally practical trying (but running the job is not instantaneous <img class="emojione" alt="😕" title=":-/" src="https://cdn.jsdelivr.net/emojione/assets/png/1f615.png?v=2.2.7"/>).</div>
</li>
<li class="level1"><div class="li"> <strong>First aid</strong> </div>
</li>
<li class="level1"><div class="li"> <strong>BIOS, overclocking</strong><br/>
playing with BIOS on Mefitas computers, demo with nitrogen cooling (Karel) </div>
</li>
<li class="level1"><div class="li"> <strong>Bollywood movie night</strong><br/>
Making a movie night with a film recommended by the Indians (maybe with some Indian snacks?)</div>
</li>
<li class="level1"><div class="li"> <strong>Radiation talk</strong><br/>
Milan Brož can bring a functioning dosimeter, show films and talk about radiation.</div>
</li>
<li class="level1"><div class="li"> <strong>Karaoke session</strong><br/>
Using PlayStation 3 + StarSinger + Mic set from the lab.</div>
</li>
<li class="level1"><div class="li"> <strong>Bollywood movie night</strong><br/>
Watching a film, drinking Indian tea and eating pop-corn. Film tips from the Indians: 3 Idiots, Kahani</div>
</li>
<li class="level1"><div class="li"> <strong>Erasmus</strong><br/>
Short description of places where we were in our Erasmus stay. It should serve as an inspiration and encouradgement for younger openlabers to apply for an Erasmus.</div>
</li>
<li class="level1"><div class="li"> <strong>Disk management</strong><br/>
Disk partitioning, clonezilla, MBR, GPT, … by Milan Broz, mozno v novom Red Hat labe.</div>
</li>
<li class="level1"><div class="li"> <strong>Traveling discussion</strong><br/>
Trip to The UK (Karel, Heno), to Estonia (Vlasta, Vita).</div>
</li>
<li class="level1"><div class="li"> <strong>C++11/C++14</strong><br/>
What is new and fascinating? (Vlada Still, Jirka Weiser)</div>
</li>
<li class="level1"><div class="li"> <strong>Kinect and such</strong><br/>
Possibilities and demo (the student of Milan Broz, possibly HCI).</div>
</li>
<li class="level1"><div class="li"> <strong>Biofeedback</strong><br/>
EEG headset by PetrS, Trans-cranial direct current stimulation (<a href="http://www.radiolab.org/story/9-volt-nirvana/" class="urlextern" target="_blank" title="http://www.radiolab.org/story/9-volt-nirvana/" rel="ugc nofollow noopener">http://www.radiolab.org/story/9-volt-nirvana/</a>).</div>
</li>
<li class="level1"><div class="li"> <strong>Bio mobile apps</strong><br/>
Mobile applications for health and biology (detecting REM sleep, making diagnostics, …)</div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"Inside Lab (A403)","hid":"inside_lab_a403","codeblockOffset":0,"secid":3,"range":"572-3069"} -->
<h3 class="sectionedit4" id="inside_lab_-_red_hat_topics_s505">Inside Lab - Red Hat topics (S505)</h3>
<div class="level3">
<ul>
<li class="level1"><div class="li"> <strong>How to create RPM package</strong> talk / miniworkshop [Red Hat, S505 room] (Milan as contact, Ondra Vasik)</div>
</li>
<li class="level1"><div class="li"> <strong> Alternative architectures (and Linux)</strong> (ARM64, PowerPC, S390, mainframes, …) [Red Hat, S505 room] (Milan as contact, Dan Horak, Jaroslav Reznik)</div>
</li>
<li class="level1"><div class="li"> <strong>Basics of Linux kernel crash dump analysis on x86</strong> [Red Hat, S505 room] (Milan as contact, Stanislav Kozina)</div>
</li>
<li class="level1"><div class="li"> <strong>Buffer overflow exploits (on Unix system - C language)</strong> [Red Hat, S505 room] (Milan as contact, Stanislav Kozina)</div>
</li>
<li class="level1"><div class="li"> <strong> Basics of Linux system monitoring: ps(1), top(1), vmstat(<img class="emojione" alt="😎" title="8)" src="https://cdn.jsdelivr.net/emojione/assets/png/1f60e.png?v=2.2.7"/>, iostat(1), proc(5), strace(1), trace-cmd(1), stap(1), ktap</strong> [Red Hat, S505 room] (Milan as contact, Stanislav Kozina)</div>
</li>
<li class="level1"><div class="li"> <strong>IBM PC: Walk through the devices of IBM PC (1979)</strong> [Red Hat, S505 room] (Milan as contact, Stanislav Kozina)</div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"Inside Lab - Red Hat topics (S505)","hid":"inside_lab_-_red_hat_topics_s505","codeblockOffset":0,"secid":4,"range":"3070-3916"} -->
<h3 class="sectionedit5" id="outside_lab_outdoor_or_just_won_t_fit_in">Outside Lab (Outdoor, or just won't fit in)</h3>
<div class="level3">
<ul>
<li class="level1"><div class="li"> <strong>LaserTag</strong></div>
</li>
<li class="level1"><div class="li"> <strong>Ant-hill casting / art</strong><br/>
Ask Lukas, if you dare :-}.</div>
</li>
<li class="level1"><div class="li"> <strong>Balooning</strong><br/>
Make hundreds of baloons and fill the conference room on 4th floor. The cheapest baboons <a href="http://www.svetbalonku.cz/cz/stredni-balonky-g90-000062.html" class="urlextern" target="_blank" title="http://www.svetbalonku.cz/cz/stredni-balonky-g90-000062.html" rel="ugc nofollow noopener">here</a> <br/>
not necessary outside, just any other room in building (we are not going to prank ourselves, are we?)</div>
</li>
<li class="level1"><div class="li"> <strong>Faculty Kabaddi Championship</strong><br/>
Playing <a href="https://en.wikipedia.org/wiki/Kabaddi" class="urlextern" target="_blank" title="https://en.wikipedia.org/wiki/Kabaddi" rel="ugc nofollow noopener">Kabaddi</a> against other labs. Winner plays with the Indians <img class="emojione" alt="😃" title=":D" src="https://cdn.jsdelivr.net/emojione/assets/png/1f603.png?v=2.2.7"/>.</div>
</li>
<li class="level1"><div class="li"> <strong>Inter-laboratory games</strong><br/>
Set up a game board (with magnetic pieces?) on the switch, play Battleship against other labs. Turns announced by mailing list. Playing intelligent version with “see count”.</div>
</li>
<li class="level1"><div class="li"> <strong>Water lifesaving</strong><br/>
Go to swimming pool (or Brno dam in summer) and learn how to help someone who is drowning (Karel)</div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"Outside Lab (Outdoor, or just won't fit in)","hid":"outside_lab_outdoor_or_just_won_t_fit_in","codeblockOffset":0,"secid":5,"range":"3917-4823"} -->
<h2 class="sectionedit6" id="used_ideas">Used ideas</h2>
<div class="level2">
<ul>
<li class="level1"><div class="li"> <strong>Key baking/signing/eating party</strong><br/>
Theory and practice about keys – GPG, SSH, ???. Workshop with setting SSH key authentication securely (agent forwarding, …). GPG keys usage. Plugins for easy GPG use. Signing actual (digital/cake) keys.</div>
</li>
<li class="level1"><div class="li"> <strong>Vlasta's social genius</strong><br/>
Some social workshop by Vlasta. Inspiration from Communication and softskills that she teaches. (persuasion techniques?)</div>
</li>
<li class="level1"><div class="li"> <strong>Yoga class</strong></div>
</li>
<li class="level1"><div class="li"> <strong>IT Slang</strong><br/>
Shotgun debugging, cargo cult programming, deep magic, black magic, …</div>
</li>
<li class="level1"><div class="li"> <strong>Archery</strong><br/>
When spring/summer comes again, we may ask, how much would an archery workshop cost. There's a shooting range on the way to Soběšice, bows can be borrowed from the Brno archery division. It will probably cost something, but making it for a group may pay off, if people are willing to try (and pay a bit for the possibility). </div>
</li>
<li class="level1"><div class="li"> <strong>FPGA programming</strong><br/>
Programming one's own Field-Programmable-Gate-Array. Potentially hosted by Lenka, access to Přenosil's lab needed.</div>
</li>
<li class="level1"><div class="li"> <strong>WSN</strong><br/>
Some talk about Wireless Sensor Networks? Some hands-on activity? Probably wise to wait for the new infrastructure.</div>
</li>
<li class="level1"><div class="li"> <strong>DRAM rowhammering</strong><br/>
Exploiting the DRAM rowhammer bug to gain kernel privileges, see article <a href="http://googleprojectzero.blogspot.cz/2015/03/exploiting-dram-rowhammer-bug-to-gain.html" class="urlextern" target="_blank" title="http://googleprojectzero.blogspot.cz/2015/03/exploiting-dram-rowhammer-bug-to-gain.html" rel="ugc nofollow noopener">here</a> and <a href="http://www.theregister.co.uk/2015/03/10/rowhammer/" class="urlextern" target="_blank" title="http://www.theregister.co.uk/2015/03/10/rowhammer/" rel="ugc nofollow noopener">here</a>.</div>
</li>
<li class="level1"><div class="li"> <strong>Metasploit basics and network scanning</strong><br/>
By Marek Kumpost.</div>
</li>
<li class="level1"><div class="li"> <strong>What lurks inside of our wallets?</strong><br/>
Inspecting our bank cards (chip, stripe, contactless), ID cards, passports, ISICs, library cards, …</div>
</li>
<li class="level1"><div class="li"> <strong>Indian culture talk</strong><br/>
Inviting some communicative Indians to present their country, cuisine, …</div>
</li>
<li class="level1"><div class="li"> <strong>Paper Airplanes</strong><br/>
How to get best performance out of one sheet of paper? (Lukáš) What happens, if the paper plane is made out of A2 or bigger paper? (And thrown from the 4th floor?)</div>
</li>
<li class="level1"><div class="li"> <strong>Cube attack</strong><br/>
Theory and practice of Cube attack, some simple exercise to get the idea? (Syso?)</div>
</li>
<li class="level1 node"><div class="li"> <strong>Assembling the computer</strong><br/>
Build your own, service your own hardware (Lukas, Karel).</div>
<ul>
<li class="level2"><div class="li"> content of your desktop PC, cleaning lab computers, adding heat-conducting paste under cooler </div>
</li>
<li class="level2"><div class="li"> vacuum cleaner</div>
</li>
<li class="level2"><div class="li"> move PC under the desk</div>
</li>
</ul>
</li>
<li class="level1 node"><div class="li"> <strong>Juggling</strong><br/>
Peter can juggle, he can teach us!</div>
<ul>
<li class="level2"><div class="li"> Balonky 200 ks, barevne, zajisti Lukas</div>
</li>
<li class="level2"><div class="li"> Jako plnidlo mouka z labu (micek 120g, celkem mame 6kg mouky)</div>
</li>
<li class="level2"><div class="li"> mikrotenove sacky a kuchynskou vahu na mouku - Petr</div>
</li>
</ul>
</li>
<li class="level1"><div class="li"> <strong>Arduino</strong><br/>
Try programming your own board, playing with LEDs and sensors.</div>
</li>
<li class="level1"><div class="li"> <strong>Ethernet crimping</strong><br/>
Workshop in cable crimping, Crimping championship</div>
</li>
<li class="level1"><div class="li"> <strong>GitHub, TravisCI</strong><br/>
Workshop in using git, GitHub, connecting to TravisCI</div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"Used ideas","hid":"used_ideas","codeblockOffset":0,"secid":6,"range":"4824-"} -->text/html2018-11-08T23:28:36+00:00Anonymous (anonymous@undisclosed.example.com)Raspberry Pi
https://crocs.fi.muni.cz/public/openlab/raspi
<h1 class="sectionedit1" id="raspberry_pi">Raspberry Pi</h1>
<div class="level1">
<p>
<img src="https://crocs.fi.muni.cz/_media/public/openlab/raspi.jpg?w=400&tok=410bd7" class="media" loading="lazy" alt="" width="400" />
</p>
<p>
<a href="https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus/" class="urlextern" target="_blank" title="https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus/" rel="ugc nofollow noopener">https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus/</a>
</p>
</div>
<!-- EDIT{"target":"section","name":"Raspberry Pi","hid":"raspberry_pi","codeblockOffset":0,"secid":1,"range":"1-140"} -->
<h2 class="sectionedit2" id="prior_to_boot">Prior to boot</h2>
<div class="level2">
<p>
<abbr title="Operating System">OS</abbr>?
</p>
<ul>
<li class="level1"><div class="li"> NOOBS</div>
</li>
<li class="level1"><div class="li"> Raspbian</div>
</li>
<li class="level1"><div class="li"> Probabbly any other Linux with ARM support</div>
</li>
</ul>
<p>
Provide enough power (undervoltage causes instability).
</p>
<p>
Connect HDMI - if applicable (no cable present at boot will by default disable video output).
</p>
<p>
Connect peripheals?
</p>
<p>
edit/create in /boot
</p>
<ul>
<li class="level1"><div class="li"> enable ssh? - create empty file “ssh”)</div>
</li>
<li class="level1"><div class="li"> preconfigure Wi-Fi? file wpa_supplicant.conf</div>
</li>
</ul>
<p>
Example:
</p>
<pre class="code">ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=CZ
network={
ssid="YOURSSID"
psk="YOURPASSWORD"
scan_ssid=1
}</pre>
<ul>
<li class="level1 node"><div class="li"> System configuration “config” file </div>
<ul>
<li class="level2"><div class="li"> force HDMI out</div>
</li>
<li class="level2"><div class="li"> many other system options</div>
</li>
</ul>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"Prior to boot","hid":"prior_to_boot","codeblockOffset":0,"secid":2,"range":"141-801"} -->
<h2 class="sectionedit3" id="first_boot">First boot</h2>
<div class="level2">
<p>
User: pi Password: raspberry
</p>
<ul>
<li class="level1"><div class="li"> Change default password?</div>
</li>
<li class="level1"><div class="li"> Connect to internet?</div>
</li>
<li class="level1"><div class="li"> apt update & upgrade</div>
</li>
<li class="level1"><div class="li"> raspi-config</div>
</li>
<li class="level1"><div class="li"> </div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"First boot","hid":"first_boot","codeblockOffset":1,"secid":3,"range":"802-956"} -->
<h2 class="sectionedit4" id="programming">Programming</h2>
<div class="level2">
<p>
Python recomended, any language should be feasible though.
Many libraries available (as usual with python <a href="https://xkcd.com/353/" class="urlextern" target="_blank" title="https://xkcd.com/353/" rel="ugc nofollow noopener">https://xkcd.com/353/</a>)
</p>
<ul>
<li class="level1"><div class="li"> <a href="https://pythonhosted.org/sense-hat/" class="urlextern" target="_blank" title="https://pythonhosted.org/sense-hat/" rel="ugc nofollow noopener">https://pythonhosted.org/sense-hat/</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://gpiozero.readthedocs.io/en/stable/" class="urlextern" target="_blank" title="https://gpiozero.readthedocs.io/en/stable/" rel="ugc nofollow noopener">https://gpiozero.readthedocs.io/en/stable/</a></div>
</li>
<li class="level1"><div class="li"> </div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"Programming","hid":"programming","codeblockOffset":1,"secid":4,"range":"957-1202"} -->
<h2 class="sectionedit5" id="ad-hoc_networking">Ad-hoc networking</h2>
<div class="level2">
<p>
example of /etc/network/interfaces
</p>
<pre class="code">auto wlan0
iface wlan0 inet static
address {{ wlan_ip }}
netmask 255.255.255.0
wireless-channel 48
wireless-essid crocs-raspi-net
wireless-txpower 1
wireless-mode ad-hoc
</pre>
</div>
<!-- EDIT{"target":"section","name":"Ad-hoc networking","hid":"ad-hoc_networking","codeblockOffset":1,"secid":5,"range":"1203-1480"} -->
<h2 class="sectionedit6" id="games">Games</h2>
<div class="level2">
<ul>
<li class="level1"><div class="li"> <a href="https://github.com/AndrewCRichards/TetriPiSense" class="urlextern" target="_blank" title="https://github.com/AndrewCRichards/TetriPiSense" rel="ugc nofollow noopener">https://github.com/AndrewCRichards/TetriPiSense</a></div>
</li>
<li class="level1"><div class="li"> <a href="https://github.com/martinohanlon/AstroPiSnake" class="urlextern" target="_blank" title="https://github.com/martinohanlon/AstroPiSnake" rel="ugc nofollow noopener">https://github.com/martinohanlon/AstroPiSnake</a></div>
</li>
<li class="level1"><div class="li"> many others</div>
</li>
</ul>
</div>
<!-- EDIT{"target":"section","name":"Games","hid":"games","codeblockOffset":2,"secid":6,"range":"1481-"} -->text/html2016-12-01T13:28:29+00:00Anonymous (anonymous@undisclosed.example.com)
https://crocs.fi.muni.cz/public/openlab/rpmpackaging
<p>
<strong>Fedora packaging links</strong>
</p>
<p>
Fedora Packaging Guidelines:
<a href="https://fedoraproject.org/wiki/Packaging:Guidelines" class="urlextern" target="_blank" title="https://fedoraproject.org/wiki/Packaging:Guidelines" rel="ugc nofollow noopener">https://fedoraproject.org/wiki/Packaging:Guidelines</a>
<a href="https://fedoraproject.org/wiki/Packaging:ReviewGuidelines" class="urlextern" target="_blank" title="https://fedoraproject.org/wiki/Packaging:ReviewGuidelines" rel="ugc nofollow noopener">https://fedoraproject.org/wiki/Packaging:ReviewGuidelines</a>
</p>
<p>
Maximum RPM:
<a href="http://www.rpm.org/max-rpm-snapshot/" class="urlextern" target="_blank" title="http://www.rpm.org/max-rpm-snapshot/" rel="ugc nofollow noopener">http://www.rpm.org/max-rpm-snapshot/</a>
</p>
<p>
Fedora GIT Tree (lze pouzit pro priklady .<abbr title="specification">spec</abbr> filu)
<a href="http://pkgs.fedoraproject.org/cgit/" class="urlextern" target="_blank" title="http://pkgs.fedoraproject.org/cgit/" rel="ugc nofollow noopener">http://pkgs.fedoraproject.org/cgit/</a>
</p>
<p>
Fedora packaging mailing list
<a href="https://admin.fedoraproject.org/mailman/listinfo/packaging" class="urlextern" target="_blank" title="https://admin.fedoraproject.org/mailman/listinfo/packaging" rel="ugc nofollow noopener">https://admin.fedoraproject.org/mailman/listinfo/packaging</a>
</p>
<p>
Rpmlint website:
<a href="https://github.com/rpm-software-management/rpmlint" class="urlextern" target="_blank" title="https://github.com/rpm-software-management/rpmlint" rel="ugc nofollow noopener">https://github.com/rpm-software-management/rpmlint</a>
</p>
<p>
Fedora-review
<a href="https://fedorahosted.org/FedoraReview/" class="urlextern" target="_blank" title="https://fedorahosted.org/FedoraReview/" rel="ugc nofollow noopener">https://fedorahosted.org/FedoraReview/</a>
</p>
<p>
Rukověť baliče RPM:
<a href="http://www.abclinuxu.cz/clanky/navody/rukovet-balice-rpm-i-uvod" class="urlextern" target="_blank" title="http://www.abclinuxu.cz/clanky/navody/rukovet-balice-rpm-i-uvod" rel="ugc nofollow noopener">http://www.abclinuxu.cz/clanky/navody/rukovet-balice-rpm-i-uvod</a>
</p>
<p>
COPR - buildění/repozitar bez nutnosti mit balicek ve Fedore:
<a href="http://copr-fe.cloud.fedoraproject.org/" class="urlextern" target="_blank" title="http://copr-fe.cloud.fedoraproject.org/" rel="ugc nofollow noopener">http://copr-fe.cloud.fedoraproject.org/</a>
</p>
<p>
Soft/weak dependencies v rpm:
<a href="http://www.rpm.org/wiki/PackagerDocs/DependenciesOverview#Weakdependencies" class="urlextern" target="_blank" title="http://www.rpm.org/wiki/PackagerDocs/DependenciesOverview#Weakdependencies" rel="ugc nofollow noopener">http://www.rpm.org/wiki/PackagerDocs/DependenciesOverview#Weakdependencies</a>
</p>
<p>
Link na prednasku (resp. puvodni verzi)
<a href="https://fedoraproject.org/w/uploads/f/fb/PackagingWorkshop.odp" class="urlextern" target="_blank" title="https://fedoraproject.org/w/uploads/f/fb/PackagingWorkshop.odp" rel="ugc nofollow noopener">https://fedoraproject.org/w/uploads/f/fb/PackagingWorkshop.odp</a>
</p>
text/html2016-12-01T13:28:29+00:00Anonymous (anonymous@undisclosed.example.com)Indian tea recipe
https://crocs.fi.muni.cz/public/openlab/tea
<h1 class="sectionedit1" id="indian_tea_recipe">Indian tea recipe</h1>
<div class="level1">
<p>
For 1 cup of tea you'll need:
</p>
<ul>
<li class="level1"><div class="li"> 2/3 cup of water</div>
</li>
<li class="level1"><div class="li"> 1/3 cup milk (ideally high-fat)</div>
</li>
<li class="level1"><div class="li"> 1/2 teaspoon tea leaves (ideally black Assam tea, CTC blend, can be bought <a href="http://www.cajovna-sklenenka.com/" class="urlextern" target="_blank" title="http://www.cajovna-sklenenka.com/" rel="ugc nofollow noopener">here</a>)</div>
</li>
<li class="level1"><div class="li"> 1 tablespoon sugar (according to taste)</div>
</li>
<li class="level1"><div class="li"> some freshly ground ginger</div>
</li>
<li class="level1"><div class="li"> couple cardamom seeds (optional)</div>
</li>
</ul>
<p>
Boil the water with ginger and cardamom seeds. Add tea leaves and then sugar. After a minute of boiling add milk and keep heated. Strain the tea leaves and spices, drink & enjoy India :-}.
</p>
</div>