''[[Gold bug|The Gold Bug]]'' and Sir [[Arthur Conan Doyle]]'s ''The Adventure of the Dancing Men." In each of these stories, a fictional detective solves a simple [[substitution cipher]] and explains to the reader how he does it. | ''[[Gold bug|The Gold Bug]]'' and Sir [[Arthur Conan Doyle]]'s ''The Adventure of the Dancing Men." In each of these stories, a fictional detective solves a simple [[substitution cipher]] and explains to the reader how he does it. |