ELECTRON-X402
A KLJN key exchange, built on physics, that makes payment authorization secure no matter how powerful the attacker's computer is.
What this is
ELECTRON-X402 names a Kirchhoff-Law-Johnson-Noise (KLJN) key exchange: a method that secures a key exchange using the physics of thermal noise in a wire, rather than relying only on computational hardness. The idea is that an eavesdropper cannot recover the key regardless of how much computing power they have, because the security comes from a physical property, not a math problem that a fast enough computer could eventually break.
The protocol is meant to secure the payment authorization step itself. This is the concept as the page has always stated it. There is no live endpoint or working demonstration of it here.