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Rewrite challenge 1

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maik
2020-12-03 11:45:39 +01:00
parent 2e6a2f6e82
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content/posts/adventofctf/challenge_1.md
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@@ -27,19 +27,21 @@ Visit <https://01.adventofctf.com> to start the challenge.
## Solution
When taking a look at the source we find the following comment:
When opening the page, we're asked for Santa's password. Unfortunately, we don't know the password. Don't stop there though, mayby someone has hidden it in the source html.
Let's open the source by pressing `Ctrl + U` and take a look at it. Near the bottom we find the following comment:
```html
<!-- This is an odd encoded thing right? YWR2ZW50X29mX2N0Zl9pc19oZXJl -->
```
If we then use `base64` to decode this string we get `advent_of_ctf_is_here`.
This looks like a `base64` encoded string so let's use the program `base64` with the `-d` decode flag to decode the text.
```bash
> echo "YWR2ZW50X29mX2N0Zl9pc19oZXJl" | base64 -d
advent_of_ctf_is_here
```
We can then enter this string on the challenge website after which it will give us the flag: `NOVI{L3T_7H3_M0NTH_0F_FUN_START}`.
We get some plain text. If we enter it as Santa's password on the challenge page, it gives us the flag: `NOVI{L3T_7H3_M0NTH_0F_FUN_START}`.
This flag can then be submitted for the [challenge](https://ctfd.adventofctf.com/challenges#1-2).