RTCP - Don't Give The GIANt a COOKie

Posted on sam. 25 janvier 2020 in CTF

solves : 397

Point : 100
It was just a typical day in the bakery for Delphine. She was preparing her famous chocolate cake, when all of a sudden a GIANt burst through the doors of her establishment and demanded a cookie. Being the strong-willed girl she was, Delphine refused and promptly threw her rolling pin at the GIANt. Doing what any sensible being would do when faced with projectiles, the GIANt let out a shriek and ran out of the shop. Delphine smiled to herself, it was another day well done.

But oh? What's this? It seems the GIANt dropped this behind while he was screaming and scrambling out of the shop.

69acad26c0b7fa29d2df023b4744bf07

We need to reverse a hash. First, check what type is the hash :

$ hashid 69acad26c0b7fa29d2df023b4744bf07                                                                                                                 
Analyzing '69acad26c0b7fa29d2df023b4744bf07'
[+] MD5

Ok, perfect. MD5 is easy to revert since a lot of rainbow tables exist to perform this operation. Crackstation is one of the website who can do it. We enter the hash and launch the search :

Hash Type Result
69acad26c0b7fa29d2df023b4744bf07 md5 chocolate mmm

The website found it and give us the clear text from it. We add the flag part and got the final flag : rtcp{chocolate mmm}.