Medium

Andreas Renz

Andreas Renz

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Jul 3

Google Is Switching to ECDSA Certificates. That Is Not the Post-Quantum Migration.

What Google actually announced

Google Is Switching to ECDSA Certificates. That Is Not the Post-Quantum Migration.

Andreas Renz

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May 15

How I Turned Claude Code into a Study Operating System

Screenshots become flashcards, misses become gap reports, and every session ends with a measurable delta

How I Turned Claude Code into a Study Operating System

Andreas Renz

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Apr 28

Solana’s quantum-readiness post: what the engineering shows, what the framing softens

Solana published a “Quantum Readiness” announcement this week. Two validator client teams behind the work, Anza and Jump Crypto’s…

Solana’s quantum-readiness post: what the engineering shows, what the framing softens

Andreas Renz

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Apr 20

Too much of the PQC market sells fear. Here is what practitioners should do first.

Vendors figured out that “Q-Day is coming” books more meetings than “show me your crypto inventory,” so that is what they ship. The…

Too much of the PQC market sells fear. Here is what practitioners should do first.

Andreas Renz

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Apr 10

Quantum-safe Bitcoin transactions without a soft fork: what the QSB paper actually says

TL;DR: A new paper by Avihu Mordechai Levy (StarkWare) describes Quantum-Safe Bitcoin (QSB), a way to spend legacy Bitcoin outputs that…

Quantum-safe Bitcoin transactions without a soft fork: what the QSB paper actually says

Andreas Renz

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Apr 9

PQC Migration Plans Have a ZK Blind Spot

Several major public PQC migration documents do not discuss zero-knowledge proof systems, even though some deployed ZK systems still rely…

PQC Migration Plans Have a ZK Blind Spot

Andreas Renz

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Apr 2

Google’s quantum threat to Bitcoin: what the paper actually says

The numbers, the gaps, and why ‘Bitcoin is dead’ headlines miss the point

Google’s quantum threat to Bitcoin: what the paper actually says

Andreas Renz

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Mar 14

Post-Quantum ZK is an Architecture Problem

Early research notes from an unfinished paper — shared to invite criticism, counterexamples, and discussion.

Post-Quantum ZK is an Architecture Problem

Andreas Renz

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Feb 15

Crypto Agility: Designing Systems That Survive Broken Cryptography

Cryptography is often treated as a permanent foundation — something selected once during system design and rarely revisited. In reality…

Crypto Agility: Designing Systems That Survive Broken Cryptography

Andreas Renz

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Feb 12, 2025

An Introduction to CIS Benchmarks: Best Practices for System Hardening

Cybersecurity threats constantly evolve, and organizations must adopt robust security measures to protect their systems. One of the most…

An Introduction to CIS Benchmarks: Best Practices for System Hardening

Andreas Renz

Andreas Renz

Cryptologist and cybersecurity researcher. CISSP. Post-quantum cryptography and ZK proof system security. Founder of Encryptorium.

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