Dmytro’s Substack

A Practical Guide to Time for Developers: Part 1 — What time is in software (physics + agreements)

The foundations: what you’re really tracking when you store a timestamp

20 hrs ago • Dmytro Huz

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February 2026

The Aha-Moment of Public-Key Encryption

A small idea behind the huge topic

Feb 13 • Dmytro Huz

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January 2026

Building Own MAC — Part 3: Reinventing HMAC from SHA-256

In the previous article, we did something slightly ridiculous.

Jan 23 • Dmytro Huz

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Building Own MAC — Part 2: Fixing AES (and accidentally reinventing CMAC)

Why intuition fails in cryptography

Jan 19 • Dmytro Huz

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Building Own MAC (Message Authentication Code): Part 1 - Encrypted, but Not Trusted

Why encryption alone is not enough

Jan 10 • Dmytro Huz

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Progress, Abstraction, Diversity, and Why Advanced Systems Break

How abstraction, diversity, and entropy shape the rise and failure of complex systems

Jan 5 • Dmytro Huz

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December 2025

Building Own Block Cipher: Part 3 - AES

Building AES the IKEA Way: Follow the Manual or It Falls Apart

Dec 25, 2025 • Dmytro Huz

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Rebuilding Cryptography From Scratch - My Complete Learning Journey (All Parts Inside)

This collection brings together all my deep-dive explorations into cryptography

Dec 1, 2025 • Dmytro Huz

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November 2025

Building Own Block Cipher: Part 2 — Block Cipher Theory & Rebuilding DES

How real encryption engines work — and how you can build one from scratch.

Nov 29, 2025 • Dmytro Huz

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September 2025

Building Own Block Cipher: Part 1- Lego Bricks of Modern Security

A hands-on journey into pseudo-random generators, functions, and permutations: the Lego bricks that make block ciphers and secure protocols possible.

Sep 30, 2025 • Dmytro Huz

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Between Foundations and Frontiers: Why I write

Exploring fundamentals and frontiers: from protocols to AI agents.

Sep 18, 2025 • Dmytro Huz

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