Hey :) do you by any chance know where to buy a handheld vigenère cipher decoder? (Similar to the one Blair had in Gossip Girl if you've seen that haha)
“This is my cipher
Don’t you have one? There was a brief period in the third grade where I
suspected my mother was reading my diary, and measures had to be taken.”
No, I’ve never seen this, but that’s cute. In fact, I’ve helped someone in a similar spot.
As for where to get one, a hacker named Nick Farr (hacdc.org) designed that model and uploaded the 3D printing plans to Thingiverse in 2008, one of the earliest designs uploaded to the site. To get one I imagine you would have to print it yourself, or find someone who will print it for you. The Creative Commons license should allow for someone to make and sell them.
There’s a listing for a similar item on Amazon, made of wood:
Beyond that I’m not sure, I’ve rarely seen cipher slide rules, other than historical examples. They are more useful than cipher wheels, but not nearly as common.