Personal homepage of Julian Krämer. 2026-03-31T14:29:25+02:00 https://juliankraemer.de/ Julian Krämer © Copyright 2003-2026 Julian Krämer – License CC BY-SA 4.0 2025-10-03T12:26:45+02:00 https://juliankraemer.de/article/letters-in-ascii-and-rot13

How letters are coded by ASCII demonstrated with a ROT13 algorithm.

<h2>Introduction</h2> <p>Some time ago, I watched a talk on <abbr title="American Standard Code for Information Interchange">ASCII</abbr> by Dylan Beattie, an excellent speaker known for presenting inspiring and thought-provoking topics. Even though I regularly work with ASCII, both professionally and personally, this talk rekindled my interest in its unique features. This article will focus on how ASCII encodes letters and demonstrate how this works through a simple ROT13 algorithm.</p> 2024-07-21T16:02:13+02:00 https://juliankraemer.de/article/phobos-a-theme-for-visual-studio-code

Presentation of my first theme for Visual Studio Code called Phobos.

<h2>Introduction</h2> <p>For several years now, I have been using <a href="https://code.visualstudio.com/" rel="external">Visual Studio Code</a> &nearr; (VSC) as an Integrated Development Environment (IDE) for different programming languages and as a general editor, both professionally and personally. It is currently the best <abbr title="Integrated Development Environment">IDE</abbr> for my workflow, even though it naturally has some weaknesses and disadvantages. I recommend using <a href="https://vscodium.com/" rel="external">VSCodium</a>&nearr; which is a community-driven, telemetry-free variant of Microsoft's <abbr title="Visual Studio Code">VSC</abbr> with binaries licensed under the <abbr title="Massachusetts Institute of Technology">MIT</abbr> license. </p> <p>One definite strength is its easy configurability. After installation, <abbr title="Visual Studio Code">VSC</abbr> does not require extensive setup and can be used immediately. Nevertheless, it offers numerous configuration options and a wide variety of extensions, allowing users to create a highly personalized environment.</p> <p>For years, I experimented with various extensions and especially different themes. Now, I have finally ventured into creating my own theme. It's called <strong>Phobos</strong> and I released version 0.1.0 on the <time>2024-06-27</time>.<p> <p>In this article, I introduce the <strong>Phobos</strong> theme and discuss its creation process.</p> 2024-05-13T19:03:22+02:00 https://juliankraemer.de/article/planning-mountainbike-tours

Prepare, plan and navigate mountain bike tours.

<h2>Introduction</h2> <p>One of my favorite hobbies is mountain biking. I try to avoid normal traffic and paved roads and prefer to ride in forests and fields. I plan my routes so that they always include some interesting sections, preferably technical trails. I use a fairly old GPS bike computer for navigation. It's a Garmin Edge 520 with a 2.3-inch color display and <abbr title="OpenStreetMap">OSM</abbr> map.</p> <p>In this article, I would like to share some information about planning and navigation.</p> 2024-05-10T17:19:42+02:00 https://juliankraemer.de/article/website-update-again

It's May 2024 and there is a new design for this website.

<h2>Yeah, New Again...</h2> <p>My website got a new design, again...</p> 2024-03-24T19:35:12+01:00 https://juliankraemer.de/article/charset-validator

Character set validation for C/C++ source code.

<h2>Preface</h2> <p>In the realm of programming, the integrity of source code is crucial. Recently, I embarked on a quest to develop a small yet powerful tool to address this concern.</p> <p><strong>cvc</strong> – a program crafted to examine C/C++ source code, ensuring that it adheres to the rules of the <em>basic source character set</em> as defined in the C standard.</p> 2023-11-26T11:15:55+01:00 https://juliankraemer.de/article/profiling-with-gprof

Analyzing code performance - profiling with gprof

<h2>Profiling?</h2> <p>Optimizing code performance is a fundamental aspect of software development, and profiling stands out as a pivotal technique in this pursuit. A notable tool for this purpose is <a href="https://ftp.gnu.org/old-gnu/Manuals/gprof-2.9.1/html_mono/gprof.html" rel="external">GNU gprof</a>&nearr;.</p> 2023-11-19T10:35:22+01:00 https://juliankraemer.de/article/advent-of-code-2023

Advent of Code 2023

<h2>Advent Season</h2> <p>As the year comes to a close, there's a buzz in the air — the Advent of Code 2023 is just around the corner!</p> 2023-11-18T16:42:02+01:00 https://juliankraemer.de/article/website-update

A new design for this website.

<h2>Update!</h2> <p>Look forward to a new digital experience as I present my website in a fresh, minimalist look!</p> 2023-08-09T18:54:26+02:00 https://juliankraemer.de/article/ssh-with-keepassxc

Manage SSH keys with KeepassXC

<h2>Password Manager</h2> <p>A password manager, such as <a href="https://keepassxc.org/" rel="external">KeePassXC</a>&nearr;, is a secure and efficient tool designed to help users manage and store their various passwords and sensitive credentials in a centralized and encrypted manner. A rather unknown feature of <strong>KeePassXC</strong> is ability to store SSH (Secure Shell) keys and provide them to an SSH agent. The procedure is described in this article.</p> 2025-10-20T14:43:00+02:00 https://juliankraemer.de/article/advent-of-code-2022

Advent of Code 2022

<h2>Advent Season</h2> <p>It's time again for advent of code! This year event brings some new programming puzzles to solve.</p> 2022-11-30T18:15:25+01:00 https://juliankraemer.de/article/technical-details-about-this-website

Technical details about my website.

<h2>Simple!</h2> <p>I like simple and plain websites with clear design and focus on content.</p> <p>This website dates back to the year 2003. Since then, it went through all phases of small personal websites. Unfortunately, it was asleep for most of the time.</p> 2022-11-19T16:24:38+01:00 https://juliankraemer.de/article/manage-git-configurations

Manage multiple configurations for Git

<h2>Introduce Multiple Git Users</h2> <p>New users of Git typically start with simple setups. But over time, the number of repositories grows. At some point, one will be eventually working with several remote servers and therefore different users. One may even come across repository-specific configurations. For this reason, it is useful to look at the organization of Git's configuration.</p>