Hebern cipher machine challenge

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The Hebern machine is the first cipher device to introduce an electrical circuitry and rotors. Unfortunately, its inventor, Edward Hebern, would never be rewarded to this in his lifetime.

The navy in 1924 was ready to buy it and to use it to cipher the most secret messages. The navy challenged W.F. Friedman to decipher ten crytograms ciphered by the Hebern machine. Friedman succeed to decipher the cryptograms and Navy disinterested in the purchase of the machine.

The Hebern system is not very secure because the fast rotor advances regularly (one step every letter ciphered or deciphered).

Problems (notes)

1st Problem (very easy)

G. Lasry 04/07/19

Rafael Pascual 24/01/21

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2nd Problem (easy)

G. Lasry 04/07/19

Rafael Pascual 26/01/21

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3rd Problem (medium)

G. Lasry 06/07/19

Rafael Pascual 27/01/21

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4th Problem (medium)

G. Lasry 06/07/19

Rafael Pascual 01/02/21

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5th Problem (medium)

G. Lasry 08/07/19

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6th Problem (medium)

G. Lasry 06/07/19

Rafael Pascual 06/03/21

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7th Problem (hard)

G. Lasry 05/06/20

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8th Problem (hard)

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