Unsolved 13-character "My name is" cipher




 * Simple ASCII transcription of the cipher symbols:
 * AENz8K8M8tNAM
 * The envelope, letter, and cipher.
 * Z13 Solutions - Solutions that fit the cipher's constraints. It is not known if any of them are correct.  With such a short text, and such a variety of solutions, there might be no way to select the correct solution.