Enigma Model I cipher machine challenge

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Manuel Vázquez & Paz Jiménez–Seral won this Challenge on May 5, 2021

Medals

1. (gold): Manuel Vázquez & Paz Jiménez–Seral (Spain, 2021-05-21),
2. (silver): Adam Castor (USA, 2023-01-30),
3. (bronze): Mahmood Tavafoghi (Iran, 2025-03-22)

• Manel & Paz are teachers in Mathematics in the University of Zaragoza. Mastering mathematics is a great help in mastering the Enigma :-).
• I'd like to especially thank George Lasry for being the beta tester for my challenges. He pointed out a large number of errors and thus contributed greatly to the final result. I think George abandoned this challenge disgusted by the excessive number of errors he found.

Presentation

The Enigma Model I is the most common Enigma machine. It was used by the German military forces: by the Wehrmacht (The Heer [army] and the Luftwaffe [air force]) since 1932 and by the Kriegsmarine [Navy] (under the name of M1, M2 or M3) later.

It was developed in 1927 as the successor of model D. The machine has Three rotors. The reflector is fixed (it is mobile in model D) but the addition of a Plugboard is an important improvement.

Problems (notes)

1st Problem (very easy)

Luigi Tomelli 01/11/18

Uwe B 26/02/19

Vázquez-JiménezSeral 01/07/20

Rafael Pascual 28/11/20

Garcia Larragan 25/04/21

Ivan Rolero 16/12/21

Diego Viver Rodrigo 20/04/22

Adam Castor 30/01/23

Mahmood Tavafoghi 04/05/23

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2nd Problem (middle)

G. Lasry 15/07/17

Luigi Tomelli 16/11/18

Uwe B 26/02/19

Vázquez-JiménezSeral 01/07/20

Ivan Rolero 16/12/21

Adam Castor 30/01/23

Mahmood Tavafoghi 06/05/23

Rafael Pascual 15/11/23

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3rd Problem (middle)

G. Lasry 15/07/17

Luigi Tomelli 16/11/18

Vázquez-JiménezSeral 06/08/20

Garcia Larragan 13/05/21

Ivan Rolero 16/12/21

Adam Castor 30/01/23

Mahmood Tavafoghi 16/05/23

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4th Problem (difficult)

G. Lasry 15/07/17

Luigi Tomelli 16/11/18

Vázquez-JiménezSeral 02/11/20

Garcia Larragan 25/07/21

Ivan Rolero 16/12/21

Adam Castor 30/01/23

Mahmood Tavafoghi 27/05/23

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5th Problem (middle)

G. Lasry 15/07/17

Luigi Tomelli 16/11/18

Vázquez-JiménezSeral 10/11/20

Garcia Larragan 25/07/21

Ivan Rolero 16/12/21

Adam Castor 30/01/23

Mahmood Tavafoghi 02/06/23

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6th Problem (hard)

G. Lasry 17/01/19

Vázquez-JiménezSeral 17/07/20

Adam Castor 30/01/23

Mahmood Tavafoghi 06/06/23

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7th Problem (hard)

G. Lasry 14/01/19

Vázquez-JiménezSeral 06/12/20

Adam Castor 30/01/23

Mahmood Tavafoghi 08/06/23

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8th Problem (hard)

G. Lasry 08/06/20

Vázquez-JiménezSeral 11/12/20

Adam Castor 30/01/23

Mahmood Tavafoghi 13/06/23

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9th Problem (hard)

G. Lasry 12/01/19

Vázquez-JiménezSeral 18/01/21

Adam Castor 30/01/23

Mahmood Tavafoghi 29/06/23

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10th Problem (hard)

Vázquez-JiménezSeral 05/02/21

Adam Castor 30/01/23

Mahmood Tavafoghi 02/12/23

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11th Problem (hard)

G. Lasry 08/06/20

Vázquez-JiménezSeral 18/10/22

Adam Castor 30/01/23

Mahmood Tavafoghi 02/01/24

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12th Problem (medium)

Vázquez-JiménezSeral 27/02/21

Adam Castor 30/01/23

Mahmood Tavafoghi 03/01/24

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13th Problem (medium)

G. Lasry 17/04/20

Vázquez-JiménezSeral 05/03/21

Adam Castor 30/01/23

Mahmood Tavafoghi 03/01/24

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14th Problem (hard)

G. Lasry 04/06/20

John Wright 15/06/20

Vázquez-JiménezSeral 17/06/20

Adam Castor 30/01/23

Mahmood Tavafoghi 31/12/24

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15th Problem (hard)

G. Lasry 17/04/20

Vázquez-JiménezSeral 16/04/21

Adam Castor 30/01/23

Mahmood Tavafoghi 24/03/25

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16th Problem (medium)

G. Lasry 06/04/20

Vázquez-JiménezSeral 09/05/21

Adam Castor 30/01/23

Mahmood Tavafoghi 16/12/24

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17th Problem (hard)

G. Lasry 02/05/20

Vázquez-JiménezSeral 10/05/21

Adam Castor 30/01/23

Mahmood Tavafoghi 16/12/24

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18th Problem (medium)

G. Lasry 02/05/20

Vázquez-JiménezSeral 21/05/21

Adam Castor 30/01/23

Mahmood Tavafoghi 16/12/24

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19th Problem (easy)

G. Lasry 03/05/20

Garcia Larragan 14/05/21

Vázquez-JiménezSeral 23/05/21

Rafael Pascual 14/03/22

Adam Castor 30/01/23

Mahmood Tavafoghi 16/12/24

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20th Problem (medium)

G. Lasry 02/05/20

Vázquez-JiménezSeral 23/05/21

Adam Castor 30/01/23

Mahmood Tavafoghi 16/12/24

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21th Problem (medium)

G. Lasry 03/05/20

Vázquez-JiménezSeral 26/05/21

Adam Castor 30/01/23

Mahmood Tavafoghi 16/12/24

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22th Problem (hard)

G. Lasry 24/05/20

Vázquez-JiménezSeral 30/05/21

Adam Castor 30/01/23

Ivan Rolero 10/05/23

Mahmood Tavafoghi 30/12/24

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23th Problem (hard)

G. Lasry 04/06/20

Vázquez-JiménezSeral 07/06/20

John Wright 10/06/20

Adam Castor 30/01/23

Mahmood Tavafoghi 23/12/24

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24th Problem (medium)

Vázquez-JiménezSeral 26/11/20

Adam Castor 30/01/23

Mahmood Tavafoghi 16/12/24

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