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Da Vincis mirror writing? Sure it didn't use the exact word but the concept is there.

Not trying to be argumentative, but mirror writing is neither encryption nor steganography. The concept is not there.

Using the mirror to make it difficult to transcribe seems like a similar concept. Sure it's not exact phrases you'll find doing "google research"

My PhD research is in steganography. I was familiar with those papers because I’d read them before.