Not really. My example could just as well be done with any public key crypto system. If you want better examples, see the SO post https://mathoverflow.net/quest

Not really. My example could just as well be done with any public key crypto system. If you want better examples, see the SO post https://mathoverflow.net/questions/22624/example-of-a-good-zero-knowledge-proof https://mathoverflow.net/questions/22624/example-of-a-good-z... But misuse of the term is most likely just because they didn't understand it in the first place. It is well defined, but rather abstract.