Rating:
Higher
======
Task description
----------------
> Take higher
>
> recorded.mp3
Solution
--------
Given was an audio file (recorded.mp3) which contains information encoded in
the high frequencies (about 12 KHz to 20 KHz) of the frequency spectrum. To
see these information, open the file in audacity and change to the frequency
spectrum view. Note that you have to change the default settings there to
include high frequencies up to 22 KHz (default is up to 8 KHz). You will see
longer and shorter bars (see audacity.png). Longer bars encode a 1, while
shorter bars encode a 0. Reading all bars will result in the following bit
pattern:
01101111
01101100
01101111
01100001
01000011
01010100
01000110
01111011
01001110
00110000
01110100
01011111
00111100
01101100
01101100
01011111
01100011
00110100
01101110
01011111
01100010
00110011
01011111
01101000
00110011
00110100
01110010
01100100
01111101
If you group them into items of 8 bit you get an ASCII representation of the
flag, which is: `VolgaCTF{N0t_4ll_c4n_b3_h34rd}`
