Supposedly a “one time pad” as I’ve described is unbreakable. Now if you’re talking about something that translates one character to a different one according to a rule like “replace each character with the one three letters farther along in the alphabet” or a fixed cipher where each character is replaced by the same other character throughout the message, you’re correct.
“Supposedly a “one time pad” as I’ve described is unbreakable.”
I probably wasn’t clear in my ‘character for character’ description. The weak point is that language has rules. There are only so many words and only so many letters.
Given the desire and enough computer time every cipher is essentially breakable.