Morse code often appears in lists of secret codes, next to the Caesar shift and the Vigenère cipher. It belongs in a different category, and explaining why is a good way to learn what cryptography actually does.
Encoding versus encryption
An encoding converts information into another form so it can be transmitted. Anyone who knows the scheme can read it, and there is no key. Morse, ASCII and Braille are encodings. A cipher transforms a message using a secret key, so knowing the method is not enough to read it.
Where Morse came from
Samuel Morse and Alfred Vail developed the code in the 1830s and 1840s for the electric telegraph. Common letters received short patterns, E is a single dot, which made transmission faster. That design is about efficiency, not secrecy.
Combining the two
Historically, operators often enciphered a message first and then sent the ciphertext in Morse. The Morse layer carried the signal; the cipher layer protected the content. Escape rooms copy this idea when they hide a Caesar-shifted word inside a sequence of dots and dashes.
A simple puzzle idea
Encrypt a word with a Caesar shift of 5, then write the result in Morse. Solvers must decode the Morse and then break the shift. That is two different skills in one small puzzle.
Speed and timing
In Morse, spacing carries meaning: a short gap separates elements, a longer gap separates letters and a longer one separates words. Puzzles that drop the gaps become much harder, because the same dots can be read as several different words.
Tools
Translate dots and dashes with the Morse code translator, and add the cipher layer with the Caesar decoder on CaesarCipher.org.
Disclosure: written by the team behind caesarcipher.org.