Articles

Lassie is doing better. Time to find her a new home — and build the procedure for it.
Two things need to happen when an animal is adopted. Its status in our shelter file ch…

I once had a dog named Lassie. Not the breed, not the pedigree. Just pure love.
This one's for her.
Let's build the report.
We already know how to load data and hold it in dict…

Five rounds. A working shelter management system.
Two files. Two dictionaries. One ID that ties everything together.
Take a moment with that.
What you built is functional, stru…

Information has always needed protection.
Before encryption algorithms, before computers, before radio — there was the simple, urgent need to say something that only one pe…

We start with substitution. As we discussed in the concept article, the cipher begins with a 6×6 grid — rows and columns labeled with the six letters: A, D, F, G, V, X…

We left Round 1 with a sorted character sequence built on a validated key. Here's where we are:
import string

all_chars = string.ascii_uppercase + string.digits

final_key =…