> For the complete documentation index, see [llms.txt](https://jedi.gitbook.io/jedi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jedi.gitbook.io/jedi/ctf-archive/wargames.my-ctf-2024/misc-the-dcm-meta-310-pts.md).

# Misc - The DCM Meta (310 pts)

### Description

\[25, 10, 0, 3, 17, 19, 23, 27, 4, 13, 20, 8, 24, 21, 31, 15, 7, 29, 6, 1, 9, 30, 22, 5, 28, 18, 26, 11, 2, 14, 16, 12]

Author: Yes

Hint : The element is the number in the list, combine for the flag. Wrap in wgmy{}

Attachment : <https://ctf2024.wargames.my/files/57fbc434501ae1caab25754bfb1f821c/challenge.dcm?token=eyJ1c2VyX2lkIjo3OCwidGVhbV9pZCI6MzQsImZpbGVfaWQiOjQ2fQ.Z3DVLg.BVDTqE0M1FqZHGQNImvXQiW6rhY>

### Solution

For this challenge, we get **challenge.dcm** file. We try to cat the inside of the file

<figure><img src="/files/o8Z8gxXnpgMcuBRWGOz2" alt="" width="443"><figcaption></figcaption></figure>

We see some suspicious character here. From the index in the description, there are 32 character in the flag. But, we only see 26 character when we cat the file. So, i try to open it wih HxD

<figure><img src="/files/rgPvBGzmzU6LLZSkHmOM" alt=""><figcaption></figcaption></figure>

We see now that the file is start with WGMY, and every 8 or 12 byte, there is a character. We can extract all of the character and print it according to the hint

```python
data = "f63acd3b78127c1d7d3e700b55665354"

indices = [25, 10, 0, 3, 17, 19, 23, 27, 4, 13, 20, 8, 24, 21, 31, 15, 7, 29, 6, 1, 9, 30, 22, 5, 28, 18, 26, 11, 2, 14, 16, 12]

result = [''] * len(indices)
for new_pos, old_pos in enumerate(indices):
    if old_pos < len(data):
        result[old_pos] = data[new_pos]

flag = 'wgmy{' + ''.join(result) + '}'
print(f"Flag: {flag}")
```

### Flag

<figure><img src="/files/ULZfOd3IqUGF0JsUebeG" alt="" width="502"><figcaption></figcaption></figure>

`wgmy{3e5a7b372766483d5c5d1c037f6b5d01}`


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