at http://enigmaco.de/enigma/enigma.html . You’ll need to have a Java plugin to run it. Be sure to hit the Reset button on the Enigma machine prior to encoding or decoding, to ensure that you’ll have the machine in a known start state.
Try encoding a short sentence, e.g., “HOW NOW BROWN COW” . As you type the message, you’ll see the output of the machine “IIYSAAJTMJEKPU”. Copy the encrypted message to your clipboard (i.e., highlight the encrypted message and hit ctrl c). Next, hit the Reset button on the simulator to get back to the initial state. Then copy your encrypted message into the simulator’s IN box (i.e., click on the IN box, and then hit ctrl v). Your decrypted message should appear in the OUT box.
Now try some more complicated encryptions. Again, start by hitting RESET on the simulator. Prior to typing your message, preset one or more wheels, and/or the connections on the plugboard. For example, you can rotate the left-most wheel one notch clockwise. Now, enter your message and copy the output. Reset the machine, make the same initial adjustments to the wheels and plugboard, and copy your encrypted message into the IN box. You should get your original message back in the OUT box.
Now, if you’ve gotten this far, you’ve mastered the Enigma machine and you’re ready to exchange a message with the class.
Again, start by resetting the machine. Then, make the preliminary machine adjustments, noting exactly how you’ve done it (e.g., second wheel one notch clockwise, top “J” connected to bottom “M” and bottom “M” connected to top “J” on the switchboard). Now, encrypt your short message and note the output.
Post your encrypted message in a response to this Conference; be sure to include the initial settings that you used in the machine.
Respond to another student’s encrypted posting by decrypting their message, and posting the plaintext that you’ve recovered.
In summary, you should have two postings in this conference: one with your encrypted message, and one with another student’s decrypted message. Feel free to post more than one message, if you’d like to experiment.
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