Jekyll2026-04-01T19:00:10+02:00https://wejn.org/feed/by_tag/programming.xmlWejn.orgWejn's corner on the interwebs, containing articles about computers (Linux), programming, system administration, and whatever else takes my fancy.Michal JirkůSwisscom 2025 security.txt challenge: full writeup2026-01-28T22:25:00+01:002026-01-28T22:33:09+01:00https://wejn.org/2026/01/swisscom-2025-securitytxt-challenge-full-writeupMichal JirkůIn Accidentally solving the Swisscom 2025 security.txt challenge I briefly hinted at the steps that I took to solve the challenge.Visualize those pesky rainbows (interactively)2026-01-14T18:25:00+01:002026-01-14T19:00:34+01:00https://wejn.org/2026/01/visualize-those-pesky-rainbows-interactivelyMichal JirkůIn the previous post (On the unreasonable difficulty of plotting pretty rainbow, fast) I spent many words coming up1 with the Ultimate Rainbow™ for visible light spectra. Well, stealing from Dr. Young, really. ↩On the unreasonable difficulty of plotting pretty rainbow, fast2026-01-10T14:56:00+01:002026-01-10T20:40:31+01:00https://wejn.org/2026/01/on-the-unreasonable-difficulty-of-plotting-pretty-rainbow-fastMichal JirkůThe problemOverengineering float serialization for no good reason2025-12-25T17:09:00+01:002025-12-25T19:24:21+01:00https://wejn.org/2025/12/overengineering-float-serialization-for-no-good-reasonMichal JirkůProblem statementLLM: Write production-ready code!2025-10-25T17:40:00+02:002025-10-25T18:23:58+02:00https://wejn.org/2025/10/llm-write-production-ready-codeMichal JirkůProblem statementAccidentally solving the Swisscom 2025 security.txt challenge2025-09-27T17:27:00+02:002025-09-27T18:59:55+02:00https://wejn.org/2025/09/accidentally-solving-the-swisscom-2025-securitytxt-challengeMichal JirkůFailing to calibrate flame-s-vis-nir-es spectrometer2025-07-31T19:09:00+02:002025-12-25T19:24:21+01:00https://wejn.org/2025/07/failing-to-calibrate-flame-s-vis-nir-esMichal JirkůProblem statementTorch Bearer Spectrometer UI2025-07-05T11:20:00+02:002025-12-25T19:24:21+01:00https://wejn.org/2025/07/torchbearer-spectroscope-uiMichal JirkůProblem statementExtracting data from Goethe Zertifikat B1 Wortliste pdf2023-12-10T16:11:00+01:002024-10-28T16:05:40+01:00https://wejn.org/2023/12/extracting-data-from-goethe-zertifikat-b1-wortlisteMichal JirkůProblem statementImplementing toy RSA in Ruby, on a dare2023-10-27T10:27:00+02:002023-10-27T17:10:02+02:00https://wejn.org/2023/10/implementing-toy-rsa-in-ruby-on-a-dareMichal JirkůProblem statement