In this task, we need to solve a substitution cipher. In the message message.txt, we are given:
- a “shifted” alphabet
- a message written in this alphabet
- a flag, also shifted
The name of the task gives a hint on how to find the right tool
I tried to compare the original alphabet with the shifted one and decrypt some text myself to better understand the algorithm:
picoCTF{5UB5717U710N_3V0LU710N_357BF9FF}