> For the complete documentation index, see [llms.txt](https://sayonara.gitbook.io/writeups/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://sayonara.gitbook.io/writeups/ctf/ensa-sics-ctf-2023/forensics-challenges/h1d33n.md).

# h1d33n

## <mark style="color:red;">Downloading Challenge Files</mark>

here is the executable file to download

{% file src="/files/tH2iXgMlSIWBnxNyyEmk" %}

in this challenge we have a wav audio file and we will use audacity to check whether this audio file hides some data inside it you can download this app from google it's free

<div align="left"><figure><img src="https://1410593648-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYI2noEqPw69jd0hR7Prp%2Fuploads%2FeM9G3pIj86mvZoTSUH3E%2Fimage.png?alt=media&amp;token=d3494027-886b-443f-b9dd-c61cef80eb49" alt=""><figcaption></figcaption></figure></div>

and then select the audio file

<div align="left"><figure><img src="https://1410593648-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYI2noEqPw69jd0hR7Prp%2Fuploads%2F5PP1WxiXqALHhN5Dz56K%2Fimage.png?alt=media&amp;token=912f70c6-525a-4cce-8939-821d4ce3bbf5" alt=""><figcaption></figcaption></figure></div>

now to see the hidden data we will open the spectogram&#x20;

<div align="left"><figure><img src="https://1410593648-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYI2noEqPw69jd0hR7Prp%2Fuploads%2FP3ecWjQEfNgr496o1d6N%2Fimage.png?alt=media&amp;token=21ec9a32-68a1-4788-8014-1e3dd7828cc3" alt=""><figcaption></figcaption></figure></div>

and then we can see the hidden data **QRSRAFLF{abvfr\_gung\_znxrf\_frafr}**

<div align="left"><figure><img src="https://1410593648-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYI2noEqPw69jd0hR7Prp%2Fuploads%2FgNw6kE38B4HMF74zCZaw%2Fimage.png?alt=media&amp;token=d431d420-1a2b-4f0d-8ba4-4edb187d1395" alt=""><figcaption></figcaption></figure></div>

and if we take a look at the readme.txt file we will see that it's giving a hint about rotation so this flag that we have found is rotated so let's decrypt this using cyberchef&#x20;

* [https://gchq.github.io/CyberChef](https://gchq.github.io/CyberChef/#input=UVJTUkFGTEZ7YWJ2ZnJfZ3VuZ196bnhyZl9mcmFmcn0)

<div align="left"><figure><img src="https://1410593648-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYI2noEqPw69jd0hR7Prp%2Fuploads%2FFIT1w12EL0nsA7TqaLly%2Fimage.png?alt=media&amp;token=39eb8bf3-b7ee-4edd-936d-91c725ab6fd0" alt=""><figcaption></figcaption></figure></div>

<div align="left"><figure><img src="https://1410593648-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYI2noEqPw69jd0hR7Prp%2Fuploads%2FSS0fofQ99pWPAonEYbB4%2Fimage.png?alt=media&amp;token=cafb3a9c-2a7d-42f4-bed3-a29eb1f63cac" alt=""><figcaption></figcaption></figure></div>

<div align="left"><figure><img src="https://1410593648-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FYI2noEqPw69jd0hR7Prp%2Fuploads%2FBvhGuZKnb2VMgQIgQwba%2Fimage.png?alt=media&amp;token=1f2074d3-339a-4a67-aad7-ef282a81e146" alt=""><figcaption></figcaption></figure></div>

## <mark style="color:red;">Flag</mark>

**DEFENSYS{noise\_that\_makes\_sense}**

Greetings from[ <mark style="color:blue;">**Sayonara**</mark>](https://github.com/ismail-arame/)