http://jenda.hrach.eu/w/ 2026-04-15T07:08:13+00:00 http://jenda.hrach.eu/w/ http://jenda.hrach.eu/w/_media/wiki/dokuwiki.svg text/html 2017-07-27T03:15:34+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/3g?rev=1501125334&do=diff Radiomodem and pppd howto For USB modem (tested with multiple Huawei and Mediatek 3G modems, T-Mobile and Vodafone operators): ~ # usb_modeswitch -v 12d1 -p 14fe -m "0x01" -M "55534243123456780000000000000011062000000100000000000000000000" -I (you will find the correct value in configPack.tar.gz from usb-modeswitch-data or similar in your distribution) text/html 2019-09-25T02:48:18+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/361?rev=1569379698&do=diff Wishlist pro pravidla provozu * Jasně definovat, kdy platí povinnost použít stezku pro (chodce a) cyklisty: * Pokud je za obrubníkem? (Hlávkův most směrem na sever, zpátky do provozu se pak fakt blbě skáče) * Pokud je za svodidly? (Podolí, Nuselák) text/html 2016-05-02T03:30:17+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/android-debian?rev=1462159817&do=diff Debian in chroot on Android <note important>This works with Debian Jessie and does not work with Debian Stretch. APT HTTP method says that it cannot create socket, permission denied. Adding user to the inet/net_raw group does not help. It might be caused by the old 3.4 kernel.</note> text/html 2015-11-28T22:16:33+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/arm-power?rev=1448748993&do=diff Power consumption of various Linux ARM devices All measured as current @ 5Vcc Summary: mA 0 100 200 300 400 500 600 v v v v v v v RPiB+ | ############.. Cubieboard2 | #############................ RPi2B | ##############........... RadxaRockPro | ####################............ OrangePI PC | #############................ RPi0[1] | ###.... text/html 2021-09-08T22:53:39+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/avr-rcosc?rev=1631141619&do=diff AtMega168 + internal RC oscillator + Arduino bootloader It took me a while to configure this MCU. Set the fuses. The biggest problem was to figure out correct BOOTSZ. Here is a convenient tool for that. /usr/share/arduino/hardware/tools/avrdude -C/usr/share/arduino/hardware/tools/avrdude.conf -patmega168 -cstk500v1 -P/dev/ttyUSB0 -b19200 -e -Ulock:w:0x3F:m -Uefuse:w:0xF8:m -Uhfuse:w:0xDA:m -Ulfuse:w:0xE2:m text/html 2021-02-09T02:35:42+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/barnevernet?rev=1612838142&do=diff Barnevernet, your Windows manager Barnevernet is a program for, eh, remote management of Windows machines. Think of it like TeamViewer, but without Big Brother and without $500 license (and with much less features). Use-case Access someone's Windows desktop by just dropping a small (14 kB) .exe. text/html 2018-02-05T00:29:40+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/bch?rev=1517790580&do=diff Exchanging BCH to BTC You can exchange your BCH for BTC and multiply your wealth by 1.075 (at the time of writing). * Send your BTC to a new key/wallet. * Download and boot Tails * mkdir -p /home/amnesia/.electrum/wallets * Download, unpack and run text/html 2021-08-17T01:54:31+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/blackweb?rev=1629165271&do=diff Blackweb, or how to fix unreadable web pages OMFG, almost all websites have long text gray on white with reduced thickness. This is unreadable with my eyes on my displays. I personally use Stylus Firefox addon to apply custom styles to webpages. However, you can also put it to chrome/userContent.css text/html 2020-05-18T00:40:24+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/bladerf?rev=1589762424&do=diff bladeRF raw stream to GnuRadio The raw bitstream (packed int16_t) is 50% smaller than standard GnuRadio format. This makes your low-end laptop happy. text/html 2019-12-05T00:28:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/blit?rev=1575505732&do=diff Towards computing a BLIT Recent research in artificial neural networks shows how to generate adversarial examples - slightly perturbed images that cause complete misclassification or other failures of the model. Is it possible to generate images that will cause surprising effects in biological neural networks? text/html 2015-11-19T23:50:33+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/blobutils?rev=1447977033&do=diff blobutils Tools to manipulate binary data in Unix, because it was a nightmare. They are not fast (written in shell and Python), I usually need to convert only several bytes, so it does not matter. <http://jenda.hrach.eu/gitweb/?p=blobutils;a=summary> Terms: bin: raw binary data; bits: ascii '0' and '1'; hex: ascii hexdump text/html 2025-08-02T15:55:27+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/bryle?rev=1754150127&do=diff Manuál na brýle Tato stránka shrnuje poznatky o korekci zraku brýlemi. Informace zde uváděné můžou vypadat triviálně, ale často mi trvalo fakt dlouho na ně přijít. A samozřejmě všechno je bez záruky. Parametry obrouček Obroučky jsou s klapičkami na nos nebo z plastu tak že nosní oblouk dosedá na nos plochou. Každému vyhovuje něco jiného. Pak mají ještě barvu, průhledná/světlá míň ruší v zorném poli. Proto je taky dobré, aby nožičky byly tenké, pokud mají centimetr a půl, neuvidíte do boku.… text/html 2020-05-18T00:44:15+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/challenges?rev=1589762655&do=diff Research ideas Here are some ideas if you don't know what to write your thesis or similar work about or just want to perform some interesting research. I wish I had time to work on them; unfortunately, I have time only for a small fraction. * An audio+video conferencing multiplatform application providing end-to-end encryption text/html 2017-05-24T23:54:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/contrast?rev=1495670060&do=diff Setting contrast in X.org Use-case: Enhance contrast when reading scanned document and document viewer does not support contrast adjustment. <note warning>XF86VidModeSetGammaRamp is broken in recent X.org. I have created an ugly patch for redshift (apply, compile, run text/html 2020-05-18T00:44:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/cs-20a?rev=1589762669&do=diff CS 20A AM-3 pressure sensor Pinout & usage. Intro These sensors are pretty popular in blood pressure meters. No datasheet exists, but reverse-engineering took only several hours. Pinout Top view (pins are not visible) + calibration CS-20A 03 AM-3 5 E 4 3 2 1 text/html 2017-12-29T08:25:24+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/dlp?rev=1514535924&do=diff List of lists of deep learning papers * <https://github.com/sbrugman/deep-learning-papers> * <https://github.com/dennybritz/deeplearning-papernotes> * <https://github.com/songrotek/Deep-Learning-Papers-Reading-Roadmap> * <https://github.com/terryum/awesome-deep-learning-papers> * <http://ufal.mff.cuni.cz/courses/npfl114/winter-2016> * <https://colah.github.io/> * <https://karpathy.github.io/> * <https://blog.statsbot.co/deep-learning-achievements-4c563e034257> * <http://caches… text/html 2016-01-24T16:32:38+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/dtmf?rev=1453653158&do=diff FFTW demo - DTMF decoder Hanging on IRC, we decided to try how fast can I write a DTMF decoder with library FFT. I estimated 30 minutes. Finally, it took me exactly one hour, and the code quality is terrible. Yes, I know that computing these 8 bins from definition would be faster and would not require fftw. text/html 2020-05-18T00:45:34+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/duga?rev=1589762734&do=diff Duga, a live video streamer Duga is a tool that combines multiple video and audio streams from cameras, microphones, files and static images. It is intended for streaming lectures in format similar to DefCon, where you need to mix slides, the speaker and the audience. Duga will be integrated to text/html 2024-11-02T22:32:43+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/ebroker-2018?rev=1730586763&do=diff Investování Toto je archivní verze stránky z roku 2018. Podívejte se na aktuální verzi. (psáno v létě 2018, pozdější edity jsou explicitně označeny) tl;dr nakoupit co největší ETF a držet je donekonečna Disclaimer: Toto nechci nikomu vnucovat, ale pár lidí se mě na to aktivně zeptalo, tak jsem vytvořil stránku, abych to nemusel psát do individuálních mailů. Toto není finanční poradenství a nejsem v oboru expert. Až tímto způsobem přijdete o peníze, tak je to váš problém. Pokud se na to necít… text/html 2025-06-28T17:48:59+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/ebroker?rev=1751132939&do=diff Investování (psáno v létě 2018, pozdější edity jsou explicitně označeny) tl;dr nakoupit co největší ETF a držet je donekonečna Disclaimer: Toto nechci nikomu vnucovat, ale pár lidí se mě na to aktivně zeptalo, tak jsem vytvořil stránku, abych to nemusel psát do individuálních mailů. Toto není finanční poradenství a nejsem v oboru expert. Až tímto způsobem přijdete o peníze, tak je to váš problém. Pokud se na to necítíte, nedělejte to. text/html 2024-12-05T22:56:12+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/ebroker2024?rev=1733439372&do=diff Investování Tato stránka popisuje můj přístup k investování: nakoupit světová obecná pasivní ETF. V první části rozebírá motivaci, v druhé části popisuje praktickou realizaci v českých podmínkách (kde a jak to nakoupit v ČR/EU). text/html 2019-09-26T14:02:10+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/eduroam?rev=1569506530&do=diff Eduroam and wpa_supplicant Consider using <https://cat.eduroam.org/>. It will generate shell script for you, but you can easily cut the configuration and certificate of your institution from it. network={ ssid="eduroam" key_mgmt=WPA-EAP eap=PEAP pairwise=CCMP group=CCMP TKIP identity="666@cuni.cz" password="nbusr123" ca_cert="/etc/ssl/certs/AddTrust_External_Root.pem" phase1="peaplabel=0" phase2="auth=MSCHAPV2" priority=1 domain_suffix_match="eduroam.cuni.cz" } text/html 2019-12-29T20:04:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/eee?rev=1577649869&do=diff Hibernation (s2disk) on Asus EEE 1005HA I'm not sure anyone uses this 10 years old laptop anymore (I use it to read ebooks, do SSH and watch non-HD video; there is no way to run current web browsers on it), but anyway: To get hibernation (and lid switch) working in recent kernels (5.3 tested), you need to add text/html 2017-05-25T00:37:17+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/elitebook-bugs?rev=1495672637&do=diff HP Elitebook 8470p bugs In comparison with low-end Asus laptops, firmware of this, uh, Elite computer does not seem to be well-engineered. * BIOS tries to parse MS-DOS partition tables (which is not its business) and if it cannot find a partition with a bootable flag, it halts boot with a generic unhelpful error. text/html 2020-05-18T00:42:45+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/elitebug?rev=1589762565&do=diff HP EliteBook (EliteBug) 8470p adventures My Asus U36S died so I have bought a refurbished enterprise HP. It was not a great deal, as is common with enterprise stuff... Pros: * 1600×900 display * CPU with AVX and AES-NI * 802.11abgn WiFi * text/html 2021-02-09T02:36:58+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/et?rev=1612838218&do=diff E.T. Phone Home It is a common trend today that applications are leaking data to the network. This is an open-source and linux-oriented list of such applications. The behavior was discovered using NSA Litoměřice's ipwatch solution, tcpdump, netstat, Burp proxy and other software. text/html 2018-09-22T21:04:10+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/firebird?rev=1537650250&do=diff uuidUDF, UUID Lib, CREATE_UUID in Firebird 2.5 * Assume Firebird 2.5.7-amd64 is in /opt/firebird * Download <https://www.ibphoenix.com/download/tools/udf#63> (mirror) * go to Source/ * Edit makefile. Add -fPIC -g to CFLAGS * make clean (yes, they ship compiled objects in distribution tarball) text/html 2015-04-09T21:34:27+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/firefox-media?rev=1428615267&do=diff Firefox media extraction with NoScript (& JS hell) Consider default Firefox with NoScript. If you load for example some random page on SoundCloud and allow JavaScript, you will see the <audio> element incl. URL in “Blocked objects”. However no matter how you click it is impossible to extract the text/html 2022-01-15T19:40:10+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/gis?rev=1642275610&do=diff Vytěžujme informace o svém okolí! :-) * zátopy * pražský WGP * mapa tam * podrobný mapový podklad * Web 2.0 interface ke katastru * <http://wgp.urm.cz/tmap/tms/aplk/arcgis_api/uap/uap.html> * <http://mpp.praha.eu/DMP/default.aspx#> a vlevo zaškrtni Informativní mapa sítí * databáze dopravních nehod, vyhledávání * SPZ pojištění * ČGS WMS * nehody realtime * Dvě ťavy * <http://www.geoportalpraha.cz/cs/mapove-aplikace> * Kontaminovaná místa - old Flash and windoze versi… text/html 2015-08-22T07:44:42+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/github?rev=1440229482&do=diff GitHub dataset download NSA Litoměřice crawled github for 1.5 million public ssh keys. The crawling was performed in the beginning of August 2015. You can download: * List of usernames registered on GitHub (73 MB) * List of public keys (420 MB) Intended use of the dataset is decloaking remote users based on SSH key fingerprint and factoring weak keys with text/html 2020-05-18T00:40:12+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/gnuradio?rev=1589762412&do=diff Installing GnuRadio from source on Debian Jessie <note important>This page is now obsolete - Debian Jessie is oldstable and there are good GnuRadio packages in current versions.</note> It's easy! Fortunately, there are now new packages in Debian Testing/Unstable (reportedly working well) and Ubuntu 16.04. There are backports in Jessie too, but text/html 2021-03-31T20:41:03+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/gsm?rev=1617223263&do=diff gsmtk - GSM sniffing toolkit gsmtk contains handy tools to sniff GSM with osmocom-bb phones and recover encryption keys on sniffed data. gsmtk is a fork of brmlab gsm toolkit. TL;DR brmlab GSM toolkit wants to support lots of great features, but it has serious bugs and no documentation at all. text/html 2015-04-27T16:17:49+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/ico?rev=1430151469&do=diff Generátor IČO import random,math check=0 for i in list(reversed(range(2, 9))): num = math.floor(random.uniform(0, 10)) check += i*num print(num, end="") check = (11 - check%11) % 10 print(check) <http://www.kolej.mff.cuni.cz/~dan/kody.html#ICO> text/html 2023-10-12T15:00:40+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/intel?rev=1697122840&do=diff Backdoors in your processor? You don't say… Abstract: We found a backdoor in Intel processors made in the 2000s, ranging from Coppermine to the early Sandy Bridge microarchitectures. The backdoor is triggered by writing a sequence of secret constants to the memory. These constants seem to be unique for a given microarchitecture and can be recovered using a side-channel attack. The backdoor can be well triggered remotely over the network and once exploited, it leads to the full system compromise… text/html 2020-05-18T00:45:19+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/kalibrate-everything?rev=1589762719&do=diff kalibrate-everything kalibrate-everything is a generalization of kalibrate-rtl, kalibrate-bladeRF, kalibrate-hackrf and other things. kalibrate-everything eats gnuradio cfile and it does not care what radio did it come from. It is intended for SDRs that don't have their kalibrate-* fork (yet). text/html 2015-02-07T19:55:28+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/kiviak-install?rev=1423338928&do=diff Installation Install Bind, webserver with PHP and MySQL. For example on Debian: lighttpd php5-cgi mysql-server php5-mysql bind9 DNS Convince someone to forward a NS subdomain to you. For example: dyn IN A your.ip.address d IN NS dyn text/html 2015-02-07T19:54:35+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/kiviak-user?rev=1423338875&do=diff Simple usage All you need to do is to add */10 * * * * wget -qO - "http://the_dyndns_server/update.php?host=myhostname&pass=secret" to your crontab. I don't want to have my password in the access log! We also support passing password with POST data text/html 2015-02-07T19:21:47+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/kiviak?rev=1423336907&do=diff Kiviak - a small Dynamic DNS implementation Kiviak is a small dyndns-like service. Features: * Automatic client registration. No hassle with user accounts anymore. * IPv6 and IPv4 support. * Simple web API. * PHP frontend, BIND backend. Kiviak was created as a school project. text/html 2016-09-10T14:27:24+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/kpz?rev=1473517644&do=diff Krabičky poslední záchrany " <a> OMFG co to proboha taháš" * zámek na kolo * smršťovací bužírka * imbus 5 * montpáka * drát * lanko * zipties * píšťalka * klíč 14/15 (chvíli po výměně pedálů, pak už ne) * text/html 2020-05-18T00:44:23+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/krokodil?rev=1589762663&do=diff Krokodil, a DICOM to SCAD converter Krokodil allows you to convert CT and MRI scans in DICOM to SCAD, so you can 3D-print plastic copies of your internal organs, which is something you secretly wanted since your childhood. <http://jenda.hrach.eu/gitweb/?p=krokodil;a=summary> Howto You need inkscape, openscad, imagemagick, gcc and maybe something more. text/html 2020-05-18T00:44:07+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/kukuruku?rev=1589762647&do=diff Kukuruku, an interactive SDR client We find some crucial features missing in currently used SDR software. (some have pointed out that you can get most of these features by mixing SDR# with various 3rd-party plugins, which unfortunately are not always open-source, multi-platform etc.) text/html 2016-09-11T12:29:53+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/linux-crapware?rev=1473596993&do=diff GFX and KMS plague Recent distributions come with shitloads of graphic crapware. These features are buggy and repeatedly lead to frozen systems. It becomes increasingly difficult to turn them all off, so that's why this page. * Kernel parameters: nomodeset nosplash * <https://bugzilla.kernel.org/show_bug.cgi?id=120551> * Optionally: i915.modeset=0 nouveau.modeset=0 gfxpayload=vga=text nofb text/html 2021-01-15T20:17:45+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/linux-insecurity?rev=1610741865&do=diff Linux insecurity People are often surprised when they discover that I regard Linux as an insecure operating system. Let's see why. <note warning>TL;DR * exploitable applications running without sandbox * fail-deadly design * no privacy policy and data management text/html 2020-08-19T16:00:01+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/megavoltik?rev=1597852801&do=diff Megavoltík (0.4 MV) - free energy ze vzduchu! Na internetech lze najít reporty, že cyklista jedoucí pod dráty VVN dostal elektrošok. Někteří lidé jim nevěří (což je pochopitelné). Tato stránka sbírá místa, kde si to můžete vyzkoušet na vlastní kůži. text/html 2020-05-18T00:45:08+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/mining?rev=1589762708&do=diff Základy hornictví a geologického průzkumu Oskenoval jsem své zápisky z předmětu MG432P09, školní rok 2017. Najdete je zde (PDF, 21 MB). Legenda k obrázkům: červeně je payload. Do zápisků prosakuje DSP a buněčná biologie, chcete prostě číst ty části které začínají nadpisem Hornictví. text/html 2015-11-16T19:41:34+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/mobilcz?rev=1447702894&do=diff "Free" mobile internet from Mobil.cz <http://www.mobil.cz/> offers free (actually 33 CZK/month that can be spend for calls and premium SMS) “32/16 kb/s” internet service. This sounds great for users like me that use mobile internet once a while for SSH and plaintext e-mails. How useful it is? text/html 2023-01-26T18:29:37+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/mv?rev=1674757777&do=diff Anténní objekty Ministerstva Vnitra Objekt 49.981N, 14.496E (Vestec) * <http://mapy.cz/s/j7Sk> * dvě yaginy na KV a pár dalších antén HF/VHF direction finder 50.281N, 14.431E (Netřeba) * <http://mapy.cz/s/j7SO> * opuštěně vypadající budka uprostřed * branka s obyč fabkou, CCTV jenom uvnitř text/html 2016-08-08T17:59:32+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/mypower?rev=1470679172&do=diff mypower, simple rtl-sdr spectrum util mypower is an alternative to rtl_power. * + support of not-power-of-two transform size * + using float FFTW instead of fixed-point magic that does not work on some architectures * - no sweeping, scanning etc. text/html 2020-05-18T00:39:57+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/network-manager?rev=1589762397&do=diff Network manager I have tried NetworkManager and Wicd and was unable to configure them to do what I wish (despite being just a regular laptop user). People keep asking what do I use instead: my own scripts. They are very simple and crude, but easier to use and debug than some daemons, at least for my use-case. text/html 2023-03-03T10:04:13+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/odorik?rev=1677837853&do=diff Odorik + pjsua + SRTP * stáhneme a zkompilujeme <https://www.pjsip.org/> - dle INSTALL souboru, ./configure && make dep && make clean && make -j 8 * vlezeme do pjproject-2.9/pjsip-apps/bin * stáhneme „Silnejsi certifikat na portu 6670“ z <http://www.odorik.cz/w/srtp#verejny_klic_certifikacni_autority> do odorik.pem * vyrobíme odorik.conf text/html 2016-01-10T03:03:04+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/optihnus?rev=1452394984&do=diff nVidia Optimus and Linux Power management modprobe bbswitch echo OFF > /proc/acpi/bbswitch OpenGL Start: modprobe nvidia-current modprobe nvidia-current-uvm echo ON > /proc/acpi/bbswitch /etc/init.d/bumblebeed start cat /proc/acpi/bbswitch primusrun your_opengl_application text/html 2015-10-25T18:37:55+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/pam-exec?rev=1445798275&do=diff pam_exec pam_exec allows you to evaluate authentication token using your custom program. Example password eval for xscreensaver: /etc/pam.d/xscreensaver: auth sufficient pam_exec.so expose_authtok quiet seteuid /opt/paranoid/unlock.sh /opt/paranoid/unlock.sh: PW=`cat -` if [ "$PW" = "nbusr123" ]; then exit 0 fi if [ "$PW" = "my-emergency-pw" ]; then echo "Help, someone is forcing me to unlock my screen" | mail fieldreport@nsalitomerice.cz sudo dd if=/dev/zero of=/dev/sda bs=1M exi… text/html 2023-01-26T22:46:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/parts?rev=1674773211&do=diff Noteworthy electronic parts Power supply * LT4320 Ideal Diode Bridge Controller * LNK304GN AC-DC Off-Line Switcher * VIPer22A almost off-line switcher * BQ76PL455A 16-Cell Industrial Battery Monitor With Passive Cell Balancing * NCP305 Low Voltage Detector (brownout) text/html 2020-04-24T20:28:17+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/pcb?rev=1587760097&do=diff Plošné spoje v brmlabu limits.h Jaký nejjemnější spoj se podaří vyrobit závisí na zručnosti, zkušenostech a náhodě. Pro představu, jenda dělá TSOP40 (rozteč pinů 0.5mm) a u SOIC (rozteč 1.27 mm) umí protáhnout cestičku mezi piny. text/html 2025-10-20T16:01:09+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/pdfwarez?rev=1760976069&do=diff Creating a searchable scanned and OCR'd book General PDF instructions (involves some resampling) Work in empty directory mkdir foo cd foo Separate to individual pages pdfseparate ../foo.pdf separated-%05d.pdf Render to PNG: for f in separated-*pdf; do t=${f#separated-}; echo convert -density 300 $f rendered-${t%.pdf}.png ; done | parallel text/html 2018-05-02T10:37:41+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/perf?rev=1525257461&do=diff perf on low-end hardware If perf binary is not available: * copy the tools/ directory of the current running kernel tree * apt-get install flex bison libc-dev libc-dev libelf-dev libslang2-dev libunwind-dev binutils-dev libiberty-dev * make -C tools/perf/ text/html 2017-12-11T19:32:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/pixel?rev=1513020771&do=diff Forever Pixel Drone telemetry reverse-engineering The goal of this project is to reverse-engineer telemetry stream from a drone. The second step would be to take the drone over. Currently, we can extract damaged JPEG frames (as the format is not yet fully understood) from the drone's camera. text/html 2020-05-18T00:43:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/plantdrm?rev=1589762632&do=diff On plant DRM Preface I'm passionate about DRM (1,2,3), backdoors (1,2) and similar technological wonders of modern capitalist information economy and especially about the means of getting them right (e.g., using proper crypto for backdoors). I stare in amazement on vendors implementing DRM into digital entertainment (of course), cars, batteries, smart phones, printers, text/html 2019-01-16T02:30:35+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/python-binfmt?rev=1547605835&do=diff binfmt support for Python scripts binfmt-misc is a way to “exec” non-native files using an interpreter. For example you can “exec” Windows .exe files using Wine or Linux binaries for another architecture using Qemu (by the way this is not widely known, but very useful text/html 2020-05-18T00:42:57+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/raspberry-packages?rev=1589762577&do=diff Remove unneeded packages on Raspberry Pi Raspberry now ships “Raspbian Lite” and Cubieboard is using <http://www.armbian.com/>. These are not bloated, so this page is no longer necessary. You may also like: * GnuRadio, Volk and RaspberryPi 2 * Prebuilt Raspberry binaries - GnuRadio, Volk, rtl-sdr and Perf. text/html 2019-01-19T16:28:59+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/repas?rev=1547915339&do=diff Odkazy na repasované notebooky Nejsem s těmi obchody nijak spojen (a s některými ani nemám osobní zkušenost), prostě sem jenom dávám odkazy, kde si vybrat, protože se mě na to lidi dost ptají. * <http://www.gigacomputer.cz/> * <http://www.pocitacezababku.cz/> * <http://www.levnapc.cz/repasovane-notebooky.html> * <http://www.importpc.cz/repasovane-notebooky.html> * <http://www.device.cz/notebooky/> * <http://www.mujnotebook.cz/> * <http://www.levne-notebooky-pc.cz/> * <https://w… text/html 2015-05-10T15:27:26+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/routes?rev=1431271646&do=diff Optimized bicycle routes in Prague Please note that they are optimized for speed. I don't mind riding in traffic (as some people do…) * Pankrác → Troja * Troja → Pankrác * Malá Strana → Hostivař * Pankrác → Háje * Pankrác → Hostivař text/html 2020-05-18T00:43:04+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/rpi-gcc?rev=1589762584&do=diff GnuRadio, Volk and RaspberryPi 2 Currently, package raspi-copies-and-fills breaks stuff for ARMv7! Remove it, or udevd, getty and others won't work! * <https://github.com/systemd/systemd/issues/8991> * <https://raspberrypi.stackexchange.com/questions/72594/failed-to-start-udev-kernel-device-manager> * <https://bugs.launchpad.net/raspbian/+bug/1779563> * <https://bugs.launchpad.net/raspbian/+bug/1573473> gnuradio/volk/kernels/volk/asm/neon/volk_32f_x2_dot_prod_32f_neonasm_opts.s:46: Er… text/html 2015-06-05T12:52:33+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/rtl-eeprom?rev=1433508753&do=diff RFC: rtl_eeprom content When using multiple rtl-sdrs at once, it is tricky to see which device ID belongs to which device. The cheapest units from China have all serial number set to “1”. I have handwritten an unique letter to each of my rtl-sdr and then programmed custom product string: text/html 2015-04-26T12:07:03+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/rtl-fm?rev=1430050023&do=diff rtl_fm and proper audio bandlimiting rtl_fm does not properly limit audio before downsampling. You will hear annoying pitch when you set lower audio rate (e.g. 24k or 16k) - it's the aliased pilot tone. But what if you can't afford 48k audio rate, for example because you are saving the stream to a small memory card? Try proper resampling with sox. text/html 2014-01-03T14:23:04+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/screen-irssi?rev=1388758984&do=diff crontab -e */5 * * * * /home/jenda/guard.sh guard.sh if ! ps x|grep -q [S]CREEN; then /usr/bin/screen -d -m irssi fi chmod +x guard.sh text/html 2020-05-18T00:44:38+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/screensaver?rev=1589762678&do=diff Example pygame xscreensaver module Example pygame xscreensaver module emulating RobCo PIP-Boy 2000 screensaver. <http://jenda.hrach.eu/gitweb/?p=screensaver;a=tree> text/html 2020-05-18T00:43:22+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/sdrplay?rev=1589762602&do=diff SDRPlay "miniSDR" clone repair A clone of SDRPlay radio has been obtained from a shady Chinese seller. Upon connecting, the device was completely dead (no activity on USB). Dissection revealed the device contains: * msi-2500 (USB, ADC and SPI bridge) text/html 2020-05-18T00:45:13+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/spyzilla?rev=1589762713&do=diff Spyzilla Mozilla products by default send some information to NSA. This guide will show you how to change these settings to other secret service of your choice or how to turn them off completely. See also list of other applications that do not respect privacy. Client certificates Check Advanced → Certificates → Ask me every time text/html 2015-09-16T00:40:57+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/squirrel-quoted?rev=1442364057&do=diff SquirrelMail not displaying some subjects/messages Got report after upgrade to Debian Jessie that SquirrelMail does not show messages using quoted-printable. <http://sourceforge.net/p/squirrelmail/bugs/2806/> --- /usr/share/squirrelmail/functions/i18n.php.orig 2015-09-16 02:31:36.763732202 +0200 +++ /usr/share/squirrelmail/functions/i18n.php 2015-09-16 02:34:27.983563079 +0200 @@ -184,7 +184,7 @@ } /* All HTML special characters are 7 bit and can be replaced first */ - if (! $… text/html 2017-07-27T03:21:46+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/ssh-dss?rev=1501125706&do=diff OpenSSH 7.1 and Mikrotik Crappy SSH implementations (like Mikrotik) support only old and broken ciphers that are now blocked by default in openssh client. This has been fixed in recent versions of Mikrotik firmware. Add this to your .ssh/config. Host foo.bar.sk PubkeyAcceptedKeyTypes ssh-rsa,ssh-dss* KexAlgorithms +diffie-hellman-group1-sha1 HostKeyAlgorithms=+ssh-dss text/html 2016-09-28T06:43:38+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/ssl3?rev=1475045018&do=diff TLS1.2 <-> SSLv3 wrapper Situation: there is a proprietary application that only supports SSLv3 and the vendor does not care. Solution: * make the application listen to 127.0.0.1:4443 or something like this * socat -v openssl-listen:443,cert=/etc/ssl/our_key_cert.pem,verify=0,reuseaddr,fork ssl:127.0.0.1:4443,verify=0 text/html 2020-05-18T00:37:48+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/start?rev=1589762268&do=diff Radio stuff * kalibrate-everything * gsmtk - GSM sniffing toolkit * rtl_fm and proper audio bandlimiting * Kukuruku, an interactive SDR client * GnuRadio, Volk and RaspberryPi 2 * RTL-SDR TCXO mod * SDRPlay "miniSDR" clone repair Computers * binfmt support for Python scripts * GFX and KMS plague * E.T. Phone Home * TLS1.2 <-> SSLv3 wrapper * Setting contrast in X.org * Radiomodem and pppd howto * Barnevernet, your Windows manager * Linux insecurity * Network ma… text/html 2020-05-18T00:43:30+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/stmdevkit?rev=1589762610&do=diff STM32 development kit A $3 “STM32F103C8T6 ARM STM32 Minimum System Development Board Module” was purchased. Programming with ST-Link/2 failed. The jumpers configure the bootloader. If the left one is “1” and the right one “0” (as on the board text/html 2019-06-21T11:32:06+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/tagger?rev=1561116726&do=diff Tagger and lemmatizer HOWTO Installation > git clone https://github.com/ufal/morphodita > cd src/ > vim Makefile.builtem - C_FLAGS += -std=c++11 -W -Wall -mtune=generic -msse -msse2 -mfpmath=sse -fvisibility=hidden -U_FORTIFY_SOURCE + C_FLAGS += -std=c++11 -W -Wall -march=native -fvisibility=hidden -U_FORTIFY_SOURCE > make text/html 2018-08-26T17:51:49+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/tcxo?rev=1535305909&do=diff RTL-SDR TCXO mod * Buy TCXO 28.8MHz 28.800M Ultra precision Crystal Oscillators DIP 0.5ppm * Desolder RTL-SDR xtal /-----------\ | 1 3 | | 2 4 | +-----------/ (top view) * Solder: * 1 ... +3.3V (can be found e.g. on the IR receiver) * 2 ... not connected * For rtl-sdr that used the small rectangular oscillator: text/html 2018-06-29T00:14:14+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/tesco-utils?rev=1530231254&do=diff tesco-utils tesco-utils sleduje ceny produktů v Tescu, a když klesnou pod zadanou mez, automaticky je objedná v itesco rozvozu. Aktuálně to využívá například brmbar. Aktuální použití: * budete potřebovat xidel * do login.conf vyplníme svoje uživatelské jméno a heslo text/html 2019-08-31T01:02:30+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/tesla-te400?rev=1567213350&do=diff Tesla TE-400 firmware upgrade Here is the single important URL which cannot be found on the internet, must be sniffed on wire: <http://update.upwitheaway.info/1509M_S9M_INTER_SAT/upgrade.cfg> If you care about the entire request: GET /1509M_S9M_INTER_SAT/upgrade.cfg HTTP/1.1 Accept: */* Accept-Language: en-us Accept-Encoding: * User-Agent: DQVOD Host: update.upwitheaway.info Cache-Control: no-cache Connection: Keep-alive HTTP/1.1 200 OK Server: nginx/1.14.2 Date: Sat, 31 Aug 2019 00:57:51 G… text/html 2016-01-11T05:29:09+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/vnc?rev=1452490149&do=diff VNC remote control Connect to a running X session $ x11vnc Then connect to host:5901 (usually; uses the first free port above 5900) Display manager with mandatory login is running Obtain its DISPLAY and XAUTHORITY (ps axue | grep [X]AUTH), # x11vnc -display DISPLAY -auth XAUTHORITY text/html 2015-11-18T21:09:24+00:00 Anonymous (anonymous@undisclosed.example.com) http://jenda.hrach.eu/w/winvideo?rev=1447880964&do=diff Creating video that can be played in Windows 7 “The video you have sent me does not work.” * Matroska file format is not supported. * H.264 video is supported, but not with the default yuvj422p color format. * MP3 sound is supported, but the sample rate 22050 S/s (and probably others) is not supported.