I was presented with a birthday greeting that used a substitution cipher. The catch is that he substituted every character of the message including symbols and substituted lowercase letters with different symbols than uppercase. Since uppercase and symbols are probably low frequency, normal frequency counts probably work.
My challenge is finding an application or website that allows me to substitute more than 26 characters. I could use search and replace in a text editor but that gets really confusing fast. I have found several tools that assume all symbols stay the same and that everything is in upper or lowercase.
I want to solve this by hand, but how can I do so many substitutions without paper?