Week 1 Code Challenge Guide
This week the code challenge provided is the Rail Fence Cipher.
This is a relatively simple cipher and is a good introduction to cryptography. it works like this:
If given a string: "Hello World!" and given a key: 4
The rail fence cipher will create the amount of rows as there are keys:
| Row 1 |
|---|
| Row 2 |
| Row 3 |
| Row 4 |
The cipher will then fill in the text, up and down the rows, until there is no more text:
| H | W | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| E | O | ! | |||||||||
| L | O | R | D | ||||||||
| L | L |
The rows are then taken and read individually like so:
Row 1
HW
Row 2
E O!
Row 3
LORD
Row 4
LL
The text is then combined: HWE O!LORDLL
Your task this week is to make a method to encrypt and decrypt a rail fence cipher, good luck!