You followed your intuition and stayed on the right track. Solving the puzzle you saved your reward, 100 Steem goes to you.
Solution
Here is a breakthrough, showing step by step what you had to do in order to solve the crypto-puzzle.
The two given hints were:
and
https://defuse.ca/b/77vhRpVHHhjTaCwGRh2IlU
User @praful was the first some who decoded the creepy sound audio file. The file was high-pitched and reversed. You could have used Audacity for instance to solve this first part.
Now comes the tricky part of the challenge. What does "Communication is the joint establishment of meaning" say? It obviously had to be related to the defuse.ca file. One Steemian, 
User
What he then did was the key to success: He overlaid the picture from the first hint with the picture of the gallery and this is what he got:
The combination was the password for the defuse file which contained another picture with a note that says, "Find my creator". Here is the picture:
The final solution to his challenge was the name Kevin Carter, the photographer of this iconic and famous picture called the The vulture and the little girl.
Great work and congratulations to the winner and all who participated. @praful you get 10 Steem for the first hint! Don't miss the next Steemit Crypto Challenge and be prepared.
Tim Said