Challenge - Week 6

https://minside.bouvet.no/bouvet-alle/nyheter/ukas-sikkerhetspost-3

Klarer du finne det skjulte budskapet her? Kodeordet følger samme format som sist: BVT{}

🎶

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Solution

Clicking the link took us to the audio file located at https://20-xum-vf-jurer-lbh-fubhyq-ybbx.bouvet.no.
A hint to the user is that 20-xum-vf-jurer-lbh-fubhyq-ybbx is a ROT13 encoding of the string 20-khz-is-where-you-should-look.

Upon listening to the wav, we can both hear a cut version of the audio from the 5 Uninhabited Islands with Dark & Mysterious Histories video.
We can also hear some background noise, which is actually an image, generated using https://nsspot.herokuapp.com/imagetoaudio.
As the image was generated using 20kHz as a cap, and that was the hint as well, we should look for something between 0 and 20 kHz.

Upon analyzing the spectrum of the image, we can see the flag.

The flag?

BVT{I-can-hear-things}