Writing — Raphael Lugmayrhttps://raphaellugmayr.at/en/writingWriting — Raphael LugmayrenHashing, encryption and digital signatures: the differencehttps://raphaellugmayr.at/en/writing/hash-verschluesselung-signaturhttps://raphaellugmayr.at/en/writing/hash-verschluesselung-signaturChecksums, confidentiality and verifiable origin serve different purposes. A decision guide for files, backups and software protocols.Fri, 18 Sep 2026 00:00:00 GMTChecking files with PowerShell: SHA-256 and the right byteshttps://raphaellugmayr.at/en/writing/powershell-dateien-pruefenhttps://raphaellugmayr.at/en/writing/powershell-dateien-pruefenA reproducible PowerShell exercise: create a test file, calculate SHA-256, compare line endings and interpret results correctly. With a PDF edition.Fri, 18 Sep 2026 00:00:00 GMTUnderstanding SHA-256: from bytes to a hashhttps://raphaellugmayr.at/en/writing/sha256-verstehenhttps://raphaellugmayr.at/en/writing/sha256-verstehenWhy a SHA-256 hash has 64 hexadecimal characters, how bytes matter and what a checksum actually establishes. With examples, a browser demo and PDF.Fri, 18 Sep 2026 00:00:00 GMTEvaluating AI agents: from a good impression to a useful resulthttps://raphaellugmayr.at/en/writing/ki-agenten-pruefenhttps://raphaellugmayr.at/en/writing/ki-agenten-pruefenAn agent can report convincingly while doing the wrong work. A framework for checking tasks, results, permissions and repeatable trials.Fri, 11 Sep 2026 00:00:00 GMTA partnership starts with a shared taskhttps://raphaellugmayr.at/en/writing/kooperationen-klar-beginnenhttps://raphaellugmayr.at/en/writing/kooperationen-klar-beginnenReach, technology and expertise can complement each other. A lasting collaboration needs a shared result and clear contributions.Fri, 11 Sep 2026 00:00:00 GMTFrom prototype to operation: what to clarify before real usehttps://raphaellugmayr.at/en/writing/vom-prototyp-zum-betriebhttps://raphaellugmayr.at/en/writing/vom-prototyp-zum-betriebAn application runs. But who maintains it, notices errors and restores data? Six questions for the transition from demonstration to daily use.Fri, 11 Sep 2026 00:00:00 GMTA book that renews itselfhttps://raphaellugmayr.at/en/writing/ein-buch-das-sich-selbst-erneuerthttps://raphaellugmayr.at/en/writing/ein-buch-das-sich-selbst-erneuertThe free book from christlichdenken.at is regenerated with every release. What happens when you treat a book like software — and why.Thu, 23 Jul 2026 00:00:00 GMTTools that hold uphttps://raphaellugmayr.at/en/writing/werkzeuge-die-tragenhttps://raphaellugmayr.at/en/writing/werkzeuge-die-tragennerve supports software development, fleetdeck handles deployment. Why I build my own tools, explain them and state their limits.Sun, 19 Jul 2026 00:00:00 GMTOne instance per institutionhttps://raphaellugmayr.at/en/writing/eine-instanz-je-einrichtunghttps://raphaellugmayr.at/en/writing/eine-instanz-je-einrichtungWhy Schulmittag uses separate instances, the responsibility this creates and why isolation alone does not guarantee security.Wed, 15 Jul 2026 00:00:00 GMTWho builds, answershttps://raphaellugmayr.at/en/writing/wer-baut-antwortet-auchhttps://raphaellugmayr.at/en/writing/wer-baut-antwortet-auchThe sentence we work by, and what it costs. Responsibility in software, teaching and under your own name.Sun, 12 Jul 2026 00:00:00 GMTSoftware for municipalities: what digitisation really needshttps://raphaellugmayr.at/en/writing/software-fuer-gemeindenhttps://raphaellugmayr.at/en/writing/software-fuer-gemeindenSchool meals on paper, spoken registrations, manual billing. What building Schulmittag taught me about municipal digitisation.Sun, 05 Jul 2026 00:00:00 GMTAI agents beyond the chat windowhttps://raphaellugmayr.at/en/writing/ki-agenten-statt-chatfensterhttps://raphaellugmayr.at/en/writing/ki-agenten-statt-chatfensterA chat window can help with ideas, but workflows need more. Why operational AI needs a workspace and a person to approve its actions.Thu, 25 Jun 2026 00:00:00 GMTWhy we use fixed priceshttps://raphaellugmayr.at/en/writing/warum-wir-festpreise-machenhttps://raphaellugmayr.at/en/writing/warum-wir-festpreise-machenAn hourly rate rewards slowness. A fixed price rewards clarity. Why at Stoicera we owe a result, not hours.Wed, 10 Jun 2026 00:00:00 GMTOpen source as servicehttps://raphaellugmayr.at/en/writing/open-source-als-diensthttps://raphaellugmayr.at/en/writing/open-source-als-dienstWhy I believe in open source as a principle, not a business model. Sharing knowledge and code.Thu, 05 Feb 2026 00:00:00 GMTTechnology and ethicshttps://raphaellugmayr.at/en/writing/technologie-und-ethikhttps://raphaellugmayr.at/en/writing/technologie-und-ethikGreat technical power brings responsibility. Thoughts on the ethical dimension of our work as developers.Tue, 20 Jan 2026 00:00:00 GMTWhy I programhttps://raphaellugmayr.at/en/writing/warum-ich-programmierehttps://raphaellugmayr.at/en/writing/warum-ich-programmiereProgramming is more than a profession: it is a way of thinking. The beauty of code and the joy of creating.Mon, 15 Dec 2025 00:00:00 GMT