Paper Enigma Machine has 6 rotors ... Since the start position of each rotor can be selected from 26 x 26 x 26 = 17,576 ways, it is possible to make initial settings of 6 x 17,576 = 140,608 ways.

In the earliest machines, up to six pairs could be swapped in that way; later models pushed it to 10, and added a fourth rotor. Thanks to the reflector, decoding was the same as encoding the text ...

If you don't know of Mavis Batey, you should. Her work cracking the Enigma machine's coded messages was crucial to the success of D-Day landings during WWII.

The Enigma machine is perhaps one of the most legendary devices to come out of World War II. The Germans used the ingenious cryptographic device to hide their communications from the Allies, who in… ...

Not distributed widely before the conflict was over, the very rare four-rotor M4 Enigma machine has an estimated auction value of between £80,000 - £120,000 ($122,000 - $183,000).

The collection, anchored by a three-rotor and four-rotor Enigma machine, is on display in the Fine and Rare Book Room in CMU’s Hunt Library in Oakland.

A rare 1944 four-rotor M4 Enigma cipher machine, considered one of the hardest challenges for the Allies to decrypt, has sold at a Christie's auction for £347,250 ($437,955).

The flea-market machine is the more common three rotor Enigma I machine. According to Dvorsky, a rarer Enigma M4, with four rotors, sold for $365,000 in 2015.