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Visualizing Elliptic Curve Cryptography Every TLS 1.3 session starts with a key exchange made via an elliptic curve. The most popular curve is Curve25519, and the exchange involves adding a "base point" P to itself over and over again: Curve25519 point addition We're looking at the heart of TLS 1.3 key exchange, but what's going on? Let's break it down into simple parts. Adding points on a curve T