Crypto-Agility in Practice: A Design Guide for Architects
Crypto-agility is measured in how long a substitution takes and how much of the system it touches. Here is what that means at the…
Quantum Teleportation, Precisely
Teleportation is a fully specified protocol with a fixed cost: one entangled pair, one joint measurement, two classical bits. Here is what it does…
Five Ways Post-Quantum Migration Programs Fail
Most post-quantum migration programs stall at the seams: certificate profiles, network paths, HSM limits, inventory gaps, and work nobody owns. Five failure modes, and…
Cryptographic Inventory: What Works, What Fails, and Why
A practical guide to running a cryptographic inventory that survives contact with a real environment: what interviews are good for, what tooling catches, and…
Planning the First Year of a Post-Quantum Program
Twelve months will not migrate an enterprise off RSA. It will produce an inventory, a working lab, a PKI that can issue post-quantum credentials,…
The Cryptography Inside a 5G Roaming Call
One roaming voice call crosses four trust domains and invokes symmetric, asymmetric and hash-based cryptography at every one. Here is the walkthrough, and what…
Beyond BB84: A Field Guide to Newer QKD Protocols
MDI, twin-field, continuous-variable and device-independent QKD each remove a different assumption from BB84. A guide to telling them apart before you design around one.
What a Quantum Computer Is Not
Part 1 of a no-hype quantum computer intro for security professionals: the category error, what breaks, what survives, and your real deadline.
Vast State, Narrow Door
Three hundred qubits hold more amplitudes than the universe has atoms; one measurement pays out 300 bits. Holevo, no-cloning, and the myth's end.
Shor: Cryptanalysis by Physics
Shor's algorithm breaks RSA by turning factoring into period-finding, then reading the period with interference. The mechanism, and what it takes.