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MyEnigma is a complete Enigma Machine simulator for your iPhone/iPod Touch or iPad.
Basically, Enigma was a cipher machine used by the Germans during World War II for the encryption and decryption of secret messages. It looked like an old typewriter with some extra features.
You can use MyEnigma to encrypt messages, send encrypted messages by email or decrypt messages sent to you. Being fully compatible with the real Enigma means you can also use MyEnigma to decode any of the original messages which can be found on Internet.
MyEnigma supports Copy/Paste to allow you to interact with any other application on your iPhone/iPod Touch. For instance, you can send an encrypted SMS or decrypt a received one.
MyEnigma can accurately simulate four different types of machines: The Army I and M3 and the Navy M3 and M4. You can read more about these in the Wikipedia.
You can actually select between the different machine types and setup them as you would with a real one: choose rotors, configure them, or use a plugboard to switch letters. All at the tip of your finger.