Humble Book Bundle [1] has often very cool books about IT, hacking, security, programming, Linux, Unix, science and other geeky stuff. Sadly there is no reliable way to download all books. This post shows how you can download all books in a quick and reliable way using a bookmarklet.
Some DNSSEC / NSEC Experiments Starting at the Root Zone
I was recently playing around with DNSSEC and figured out that the root DNS zone . uses NSEC and not NSEC3 to prove the absence of a resource record. This looked interesting to me and triggered some ideas. So I did some experiments and here are the results.
Advent Calendar of Advanced Cyber Fun 2018 Write-Up
There is an advent calendar on http://xmas.rip/ that has a little network riddle every day:
The riddles are very fun. I solved all except for the one on day 22.
Here are my solutions.
WireGuard VPN Road Warrior Setup
WireGuard is a relatively new open-source software for creating VPN tunnels on the IP layer using state of the art cryptography. I attended a self-organized session by the creator and developer Jason Donenfeld at the 34c3 who explained how WireGuard works and how it can be used. I was quite impressed by it’s simplicity and gave it a try. It worked more or less out of the box. Now I created a more advanced setup for accessing my home network.
In this blog post, I will describe how you can use it to remotely access your home or corporate network from any external network as a so-called road warrior.
Tool/Script to encode and decode base16 (Hex) data
The RFC 4648 (The Base16, Base32, and Base64 Data Encodings) defines different methods to encode binary data. Every Unix like system has the tool base64 installed to encode and decode data using the base64 alphabet. This alphabet includes the characters A-Z, a-z, 0-9, +, / for the data and = for padding. The base16 encoding … Read more
Fix the photos taken by your Jolla phone (EXIF date/time, rename, rotate)
If you take a photo with your Jolla phone, the date and time is not saved in the EXIF data. I like to have these data stored in my pictures, so they can easy be renamed. I wrote a script to add the date and time to the EXIF data based on the timestamp on the filesystem.
Arch Linux installation with GPT, LUKS, LVM and i3
This post describes an installation of Arch Linux with GPT (GUID partition table), LUKS (Linux Unified Key Setup) and LVM (Logical Volume Manager) with the basic graphical window manager i3. LVM is set up on top of LUKS. Systemd-boot is used as an EFI compatible boot manager. I wrote this post, so next time I don’t have to search all the information in the Arch Linux Wiki. For more details, consult the links in the reference section.
Important: This is not a beginners guide for an Arch Linux installation, so you should have basic understanding of Arch Linux, LUKS and LVM. You should understand all options so you can adjust them to your needs.
Script um eigene IP Adressen anzuzeigen (myip)
Jedes mal, wenn ich meine IP Adresse wissen will, gebe ich bei einer Suchmaschine “my ip address” ein und klicke auf eines der Ergebnisse. Dies ist nicht sehr elegant. Auf einem Server ohne Browser ist dies gar nicht möglich. Deshalb habe ich ein Script geschrieben, welches mir meine IP Adressen (IPv4 und IPv6) anzeigt. Download … Read more
Vi als Source Code Viewer in Firefox verwenden
Über die Option “View Page Source” im Kontextmenü von Firefox kann man sich den Webseitenquelltext anzeigen lassen. Dieser wird zwar schön mit Syntax Highlighting dargestellt, aber die Navigation mit den vi Keybindings oder die Möglichkeit den Quelltext temporär anzupassen fehlt. In diesem kurzen Post wird gezeigt, wie der Source Code Viewer angepasst werden kann.
Einfache Bildschirmlupe unter Linux (Screen Magnifier)
Will man bei Präsentationen Codebeispiele oder kleine Details zeigen, steht man oft vor dem Problem, dass der Text zu klein ist, oder bei grosser Schriftgrösse der Bildschirm überladen wirkt. Deshalb kann eine Bildschirmlupe bei einer Präsentation sehr praktisch sein. Bestehende Bildschirmlupen In den offiziellen Arch Linux Repos befindet nur eine KDE Bildschirmlupe, welche viele Abhängigkeiten … Read more