Update challenge 0

content/posts/adventofctf/challenge_0.md

@@ -25,20 +25,23 @@ Do you remember the flag in the teaser website?
 
 ## Solution
 
-Use the Wayback Machine to get the teaser page.
+Sadly, the teaser website isn't online anymore. If only someone kept an archive of the internet. This is where the Wayback Machine on [archive.org](https://archive.org/) comes in handy.
-<https://web.archive.org/web/20201112020839/https://adventofctf.com/>
 
-When taking a look at the source we find the following comment:
+So, let's use the Wayback Machine to get the teaser page. <https://web.archive.org/web/20201112020839/https://adventofctf.com/>
+
+When we take a look at the source html of the page we find the following comment:
 
 ```html
 <!-- Ceasar worked on this you know. Tk9WSXtIRVlfMVNfVGgxU19AX0ZsYTk/fQ== -->
 ```
 
-If we then use `base64` to decode this string we get `NOVI{HEY_1S_Th1S_@_Fla9?}`.
+It looks like some encoded string. If you've been doing CTFs for a while you'll probably recognize it's encoded in `base64`. We can use the program `base64` to decode this string.
 
 ```bash
 > echo "Tk9WSXtIRVlfMVNfVGgxU19AX0ZsYTk/fQ==" | base64 -d
 NOVI{HEY_1S_Th1S_@_Fla9?}
 ```
 
+We found the flag! It's `NOVI{HEY_1S_Th1S_@_Fla9?}`.
+
 This flag can then be submitted for the [challenge](https://ctfd.adventofctf.com/challenges#0-1).