Grover and the Honest Speedup
Grover gives a quadratic speedup, and almost nobody can use it. Why AES survives the quantum era, what the halving figure means, and what…
The Impossible Coin
A device that randomizes once and un-randomizes twice, with no record anywhere. The quantum interference experiment that ends the hidden-value story.
The Classical Bit You Don’t Know Yet
Everything you believe about a bit you haven't looked at, made precise: definite values, probabilities as ignorance, and why mixing never un-mixes.
Quantum Amplitudes: The One New Rule
Quantum amplitudes for security professionals: probability-like numbers that go negative, the Born rule, and what superposition actually says.
Entanglement-Based QKD: How E91 and BBM92 Actually Work
E91 and BBM92 both distribute entangled photon pairs, but they verify security in completely different ways. That difference decides what you have to trust.
FIPS 140 and What Validation Actually Certifies
A FIPS 140 certificate names one module, one version, one tested environment and one mode of operation. Here is how to read one, and…
BB84 Explained: How Quantum Key Distribution Actually Works
Bennett and Brassard's 1984 protocol turns key distribution into a physics problem. Here is the mechanism, the eavesdropper maths, and the four things BB84…
Q-Day and Y2K: What the Comparison Gets Right
The Y2K analogy is useful for justifying the budget and misleading about the schedule. Here is which half of it to keep.
What Quantum Computing Actually Is
The 'tries every answer at once' story is wrong, and it leads to the wrong investments. A plain account of qubits, interference, and the…
Inside ITU-T Y.3800: The Reference Model for QKD Networks
ITU-T Y.3800 turned quantum key distribution from a point-to-point demonstration into a network architecture. What its four layers define, and what they leave open.