Decrypting
To decrypt, all one must do is wrap the leather strip around the rod and read across. The ciphertext is: "HENTEIDTLAEAPMRCMUAK" Every fifth letter will appear on the same line, so the plaintext becomes
HELPM...return to the beginning once the end is reached ...EIAMUNDERATTACKAfter inserting spaces, the plaintext is revealed: "Help me I am under attack".
Read more about this topic: Scytale