What’s the “Ed” in Ed25519?

Curve 25519 is one of the most trusted elliptic curve methods, and there’s a chance you are using it on a daily basis. With this, you may be connecting to a remote service and performing a key exchange using X25519. This is a key exchange method that uses Curve 25519. Basically, we have a Montgomery curve defined by:

And here is a plot:

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Prof Bill Buchanan OBE

Prof Bill Buchanan OBE

Professor of Cryptography. Serial innovator. Believer in fairness, justice & freedom. Based in Edinburgh. Old World Breaker. New World Creator. Building trust.