As an IT student, I have access to a huge ass computing farm. Therefore I tried to crack the code Cho fpund in Bertrams storage room by bruteforcing allmost every encryption method known to humanity for several hours until I got kicked out of the library.
However, it seems to me that it does not say anything. It will propably mean something for whoever cracks it in the show, but it is not meant to be decrypted by "one of us" as it is more or less senseless symbols.