Dmytro’s Substack

Rebuilding TLS, Part 2 — Adding Integrity to the Channel

We teach our protocol to detect tampering, make records less naive with sequence numbers, and then switch to the AEAD style used in real systems.

Apr 5 • Dmytro Huz

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March 2026

Rebuilding TLS, Part 1 — Why Encryption Alone Is Not Enough

From transparent TCP traffic to encrypted records — and the first reason TLS needs more than encryption

Mar 29 • Dmytro Huz

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Rebuilding TLS From Scratch — My Complete Learning Journey

This collection brings together my attempt to rebuild TLS from first principles

Mar 27 • Dmytro Huz

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A Practical Guide to Time for Developers — The Complete Series

Time looks simple until you have to trust it.

Mar 19 • Dmytro Huz

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A Practical Guide to Time for Developers: Part 4 -The Linux Time Sync Cheat Sheet

RTC, system clock, PHC, NTP, PTP, ptp4l, and phc2sys — the practical map of how time works in Linux

Mar 19 • Dmytro Huz

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A Practical Guide to Time for Developers: Part 3 — How Computers Share Time

How computers synchronize time with NTP, PTP, and timestamping in Linux

Mar 16 • Dmytro Huz

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Cloud Sells Geographical Abstraction. Critical Systems Buy Geographical Proximity.

What recent disruptions around AWS infrastructure in the Gulf reveal about latency, sovereignty, and the hidden geography of modern cloud systems

Mar 15 • Dmytro Huz

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I built ac-trace to question the trust we place in passing tests

ac-trace is an early, narrow experiment in checking whether tested systems are actually defended

Mar 9 • Dmytro Huz

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A Practical Guide to Time for Developers: Part 2 — How one computer keeps time (Linux)

explained by one diagram

Mar 5 • Dmytro Huz

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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

Mar 1 • 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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