in Morse code stands for the distress message "SOS." A cipher, on the other hand ... If you can see the animated boxes at left, the plugin is already installed. If you do not see the boxes ...

Now try creating a more complex cipher. Cut out the NOVA Decoder Ring and NOVA Cipher Code Ring and the window marked INDEX. You are now going to put this simple message into a complex cipher.

Cracking the 340-character cipher was so computationally heavy, says Oranchak, that no one in 1969 could likely have decoded the Zodiac’s message — which suggests the killer didn’t know just how ...