Fichier audio étrange
Challenge
J'ai reçu ce fichier audio par un ami. Serait-ce un message caché ?
Attached was this audio file:
Solution
During CTFs, when you need to work with an audio file, know that Audacity is your friend. It really is the reference for editing and tweaking audio.
When I listened to it for the first time, I immediately noticed it was sped up. By clicking on Edit > Audio Clips > Pitch and Speed... I was able to slow it down and lower the pitch.
But I was still not able to make out what was being said so I tried to invert it (Effect > Special > Invert) and reverse it (Effect > Special > Reverse). Then more tweaking by slowing down and lowering the pitch until I could finally make out what was being said: akgmnv0tsw6632a.
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