A short note on signal processing fundamentals
Sampling bounds, aliasing and reconstruction are often summarised in one sentence and misunderstood in three different ways. This note walks through a worked example with discrete spectra.
Latency, bandwidth and what they actually measure
Throughput tests conflate several effects: window sizes, queueing, and the path the packets really take. Here is how to design a measurement that separates them.
Key exchange in plain words
What a Diffie-Hellman exchange does and does not prove, and why the authentication layer matters more than the math.