Lens of Deciphering?

[Shadekeep]

Originally Posted by FireHorse

I wonder… if you used a Vigenère cipher, would you need a separate Lens for each keyword that might be used?

I'd say yes. That gets into the "programmable rules" aspect of ciphers that I was asking about. I think ciphers with straight 1:1 correlations work, but not those which use what one might term "mechanical logic". Thus the Lens wouldn't work like an Enigma machine, or anything else that requires a variable input to calculate the cipher. A Lens trained on a single fixed input might work, but would be of more limited value in terms of the cipher's overall strength.

Something like a book cipher would be right out.