[MITRE STEM 2015] [Crypto 100 – Gravity Falls] Write UpDescription
The only instruction we got was a picture :
Resolution
Thanks to our good friend big brother Google reverse image search, we found out the cypher is based on a cartoon :
We used the correspondence table:
Source
The plain text message is the following :
MCA DASH B F ZERO C TWO ONE TWO SEVEN
Flag : MCA-BF0C2127
http://gravityfalls.wikia.com/wiki/List_of_cryptograms#Author.27s_symbol_substitution_cipher
Why I follow this cipher and decode it as: MCA DASH FOUR TWO SIX NINE SIX C SIX C
Submit flag MCA-42696c6c and I got point, too?
The flag has changed during the night because somoene leaked the original one on IRC.