given description is disappointed so not flow the description. Then it is easy to solve

67847010810197110123678289808479718265807289125

Search about DTMF

You do have to find the right DTMF decoder tool, and then manually spellchack the resulting flag. Fun, but easy

piece of cake

First I felt like it was impossible. But I solved it

Hint: DTMF

If You Got Numbers convert them from decimal to ASCII

One of the most interesting challenges on CTFlearn. Thank you, GreenGoblin30!

It is called "DMTF", stands for Dual Tone Multi Frequency

for newbie, here is the step: 1. decode the file here http://dialabc.com/sound/detect/ 2. you get the number, so listen again the file to group the number 3. then, convert that decimal number to ascii character here https://onlineasciitools.com/convert-decimal-to-ascii

delete it, let people think

What a spoiler... You could've at least provided source to a Wikipedia article, and not the entire objective flow of solving the problem.

delete, delete delete

Can you get the correct file so we can correct this?

What if the user is deaf? I would not be able to solve this without some help as I am deaf

Guys read about dial tone and DTMF decoding, search online tools or use git hub tools to extract numbers from the the .wav file. Listen how numbers are being typed, its important. Then try to decode numbers. Thanks to that challenge I've learned about DTMF and how to it works. I've also learned how to write python script for decoding these numbers.

That was really cool and interesting, I've never done anything like that before

First I felt like it was impossible. But I solved it

WOW dtmf New Cipher CTF. Every one want to take this CTF. Good Job bro :{)

Thanks