A tech blog.https://arijitk.in/https://arijitk.in/posts/totp-as-primary-auth-system-design/https://arijitk.in/posts/totp-as-primary-auth-system-design/A system design case study on using TOTP as the sole authentication mechanism for a short-lived internal tool: why identity providers were overkill, why unauthorized reads don't matter when the data is meant to be broadcast, and why sometimes the best architecture is the one you can ship this week.Sun, 31 May 2026 00:00:00 GMThttps://arijitk.in/posts/tbd-release-branch-strategy/https://arijitk.in/posts/tbd-release-branch-strategy/A deep-dive into TBD + Release Branch — the hybrid Git branching model that combines trunk-based speed with release-grade stability. Covers workflows, release mechanics, hotfixes, conflict strategies, and Q&A.Mon, 20 Apr 2026 11:30:00 GMThttps://arijitk.in/posts/totp-how-two-factor-auth-works/https://arijitk.in/posts/totp-how-two-factor-auth-works/A deep dive into RFC 6238 Time-based One-Time Passwords: the math behind the 6-digit code, how HMAC-SHA1 produces it, and a complete Python implementation built without any TOTP library.Fri, 17 Apr 2026 00:00:00 GMThttps://arijitk.in/posts/desktop-clock-widget-wpf-dotnet/https://arijitk.in/posts/desktop-clock-widget-wpf-dotnet/A walkthrough of building a feature-rich desktop clock widget with WPF and .NET 10: analog + digital faces, full color customization, alarm, stopwatch, countdown timer, and zero taskbar footprint — all in pure vector graphics.Thu, 16 Apr 2026 00:00:00 GMThttps://arijitk.in/posts/git-merge-rebase-strategies/https://arijitk.in/posts/git-merge-rebase-strategies/A deep dive into Git's merge strategies — merge commits, fast-forward merges, and rebases — with ASCII graphs, pros and cons, and guidance on when to use each.Wed, 15 Apr 2026 10:00:00 GMThttps://arijitk.in/posts/dafit-desktop-reverse-engineering-ble-smart-bands/https://arijitk.in/posts/dafit-desktop-reverse-engineering-ble-smart-bands/A deep dive into building a C++20 command-line tool that connects to Da Fit / MOYOUNG smart bands over Bluetooth LE, decodes the proprietary GATT protocol, and renders a health dashboard with ANSI art — all without the official app.Wed, 15 Apr 2026 00:00:00 GMThttps://arijitk.in/posts/trunk-feature-based-development/https://arijitk.in/posts/trunk-feature-based-development/A comprehensive comparison of TBD and GitFlow covering workflows, release mechanisms, conflict management, and framework upgrade strategies.Tue, 14 Apr 2026 11:30:00 GMThttps://arijitk.in/posts/first-post/https://arijitk.in/posts/first-post/This is the first post on my new Astro-powered blog.Sun, 08 Mar 2026 00:00:00 GMT