Cryptanalysis

Hi!

I’m not sure how to do this one. I have looked at the ch7.bin file, but don’t see how you should substitute all non-letters. And how should you substitute the normal letters? Do you have to try and substitute all characters with others to get a normal word?

Read it in binary -> hex and try to shift it

I don’t know how to continue. I found the string "The quick brown fox jumps over 13 lazy dogs.", applied the ROT13 but doesn’t work. Applied some other shift techniques but any of the work.
I tried to exclude the blank spaces. Nothing is working.

I’m down with this challenge.
What I found: encoding from the .bin, and I read documentation for substitute letters
But I don’t have only letters on hexa, but also unknown characters.