cipher decryption tool

[nightfox82]

Hi there,


New to the forum and new to learning python 3. So hi all :)

I'm studying ethical Hacking in my own time and have been working on different things like OverTheWire Bandit etc. I recently started their Krypton machines and have to decode a Vigenere Cipher. I got the answer already as there is so many ways to decode Vigenere online but that's lame and I wanted to create a program myself.
The program needs to look down a column on the left. starts at A and runs down the Y- axis to Z. At each row it looks across the table to until it meets the first letter of the given encoded letter. It looks at the corresponding letter on the X- axis and prints it out. It will do this 26 times. After that it will do the same for the next letter and so on. The user will then be able to look down the output until a plain text English word appears.



output would be something like:
T H E < -- decoded word.
S G D
R F C
Q E B

I obviously am not looking for someone to write this for me but not sure where to start. thanks :)