All cryptography is public-key cryptography if you did it wrong enough.

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@niconiconi The first “public key” software I ever found (on a BBS) had a public key that I am pretty sure was reversibly derived from the private key using a static key hidden in the binary. It certainly wasn’t RSA or any other known public key algorithm of the time, because the keys were way too short for anything but ECC, but this was around 1990 which would have been really early for that.

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