Morse Audio Transmitter

Sends text as Morse code audio. Optional Vigenère cipher encryption. Pair with the Morse Listener to receive.

Message

Encryption (optional)

—

Vigenère cipher. Key shifts each letter by the key character's alphabet position. Receiver needs the same key. Numbers and punctuation pass through unchanged.

Tone

frequency 700 Hz

waveform

volume 70%

speed (WPM) 12

Transmit

no encryption

ready

How encryption works

Vigenère cipher: the key is repeated over the message. Each letter is shifted by the corresponding key letter's position (A=0, B=1, … Z=25). So with key "KEY" and message "HELLO": H+K=R, E+E=I, L+Y=J, L+K=V, O+E=S → "RIJVS". The receiver decodes by shifting back using the same key. This is a classical cipher — not cryptographically strong, but it obscures the message without special software on either end. Both sender and receiver just need to agree on the key beforehand.