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# System prepended metadata

title: AmateursCTF 2024

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I have participated in AmateursCTF 2024 with Students Taking Flags United and we achieved 5th out of 1536 teams and 1st in open division.

Due to overlapping of three CTFs (Amateurs, TAMU, Belka), and I am on a trip and have two assignment deadline waiting for me :((((, I only solved two challenges in Amateurs. Thank you all the bigbigs who carried me.

**OSINT/ Bathroom-Break**

> I was on an in-state skiing trip with my family when we decided to go out and see some sights. I remember needing to go to the bathroom near where these pictures were taken and then leaving a review. Can you find this review for me?

we are given two images, where after putting on google lens we know it is from Hot Creek. since the description said he went to bathroom near hot creek then the next thing we need to do is to find that bathroom.

![螢幕截圖 2024-04-10 上午10.49.28](https://hackmd.io/_uploads/rJHqVTmlR.png)

In one of the bathroom we found a fishy comment from a fishy account

![螢幕截圖 2024-04-10 上午10.49.52](https://hackmd.io/_uploads/BypjNp7lA.png)

The bottom part is clearly a url, so we type that in the browser and it was linked to a pastebin where flag lies inside.

amateursCTF{jk_i_lied_whats_a_bathroom_0f9e8d7c6b5a4321}



**MISC/ Densely-Packed**

> You can make anything sound like laughing if you try hard enough with an imagination. mussmile

We are given a wav file, when you play the file you can only heard a high pitch voice which sound completely nonsense. But if you have play with audio before or watch those speed up video maybe you will remember that when a audio is speed up a lot, the pitch sound higher. So when we slow down the audio to 0.09x, we will get back a normal speed and pitch. It still sound nonsense tho. But since we can clearly identify that the audio now is a female speaking something, after you reverse the audio you get back the original which the voice is actually speaking out the flag.

amateursCTF{inverse_transformations}

p.s. I completely ignore the 's' in transformation**s** which cost me extra 10 minutes struggling and I even import the file to some voice to text translator...........


