![GMU Special Collections Research Center (SCRC) on Twitter: "This week's #FridayFinds features The Paper Enigma by Thomas Parker Williams. The Paper Enigma is based on the rotor concept used by the German GMU Special Collections Research Center (SCRC) on Twitter: "This week's #FridayFinds features The Paper Enigma by Thomas Parker Williams. The Paper Enigma is based on the rotor concept used by the German](https://pbs.twimg.com/media/DlYH4isU4AAMfgO.jpg)
GMU Special Collections Research Center (SCRC) on Twitter: "This week's #FridayFinds features The Paper Enigma by Thomas Parker Williams. The Paper Enigma is based on the rotor concept used by the German
![espionage, German "Enigma" machine, used for the encryption and decryption of secret message, in service 1923-1945, Additional-Rights-Clearences-Not Available Stock Photo - Alamy espionage, German "Enigma" machine, used for the encryption and decryption of secret message, in service 1923-1945, Additional-Rights-Clearences-Not Available Stock Photo - Alamy](https://c8.alamy.com/comp/F0EWEX/espionage-german-enigma-machine-used-for-the-encryption-and-decryption-F0EWEX.jpg)
espionage, German "Enigma" machine, used for the encryption and decryption of secret message, in service 1923-1945, Additional-Rights-Clearences-Not Available Stock Photo - Alamy
![WWII Enigma Machines Among Computing Treasures Added to University Libraries Collection - News - Carnegie Mellon University WWII Enigma Machines Among Computing Treasures Added to University Libraries Collection - News - Carnegie Mellon University](https://www.cmu.edu/news/stories/archives/2018/february/images/Enigma_4_OpenSide-900x600-min.jpg)