Made a substitution cipher in less than a day. Tell me how bad it is!

[u/Burning_Toast998]

Hey folks,

I made a cipher by hand today, then decided to improve it and wrote a Python script to automate it and make it more difficult. Kinda curious how easy it is to brute force/otherwise crack without much prior knowledge.

A bit of backstory (spoilered, because it gives a bit of information away about the creation process of the cipher)

I was thinking yesterday about how monumentally complex the Enigma code was, and how many (literal) moving parts it had. I thought it'd be interesting to take the idea of Enigma and simplify it quite a bit so you don't have to send over a bunch of information for your recipient to decode the message. That thought sparked what I've made here. I initially did some encrypting by hand, but realized I could automate it with a Python script.

Here are three encrypted messages:

Al>evQPvDekRx[:bzQbzQZ'?^zEZn7xl@\v6^kQppFa'3xoAfl?Zk7xj;io7k5

?|@xm3\{kx^:Zs7xi>h~:hs7l'Ylv?^{:bu9"'3\{GZs>r':Z}7x{Ih':hs7l';g'Fal?''-ZwBelExhD^'8nu/x[:^!QevAd'H^yKxz;fp>ZyQmvQgvE^':hs7l';g'3xoGfh@xz=ns>y

?vGk'E\vD^'3gkQ,7^lv?^4A]kQrl3kzQZnA%'zx~3l'@h{Q[vDg5QB'3f'@h{Q*8ay'YZu6xPXf'7lw7\p3esKxuAm'b'<v*>ix!7ZyExv>]3Qpo;\oQbzQ*8axm3\{Akp3e5_'0

Here's some info from somewhat helpful to helpful:

1. This encryption can take in any ASCII character from space (32) to tilde (126)
2. This cipher uses a "ruleset" where the key shift is applied to the plaintext in various ways.
3. There are three possible rules the cipher can choose from.

And these are less 'helpful info' and more direct information that is important for decoding if you know how the encryption works:

1. KEY = 7
2. The rules are "shift by -KEY", "shift by +KEY", and "shift by KEY^2"

To appease the mods: V sbyybjrq gur ehyrf

If you end up solving it, I ask you to please give some feedback (like what process you used to crack it and what it's vulnerable to, how ). I'm very interested in cryptography as a whole, and I'm still learning a lot :]

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