B-21 cipher machine challenge


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The B-21 encryption machine was developed in the 1925 by Boris Hagelin. The machine was used by several companies and armies.

Reference: Hagelin B-21 and B-211

Problems (notes)

1st Problem
(very easy)
Luigi Tomelli
31/12/18
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2nd Problem
(easy)
Luigi Tomelli
31/12/18
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3rd Problem
(medium)
Luigi Tomelli
31/12/18
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4th Problem
(medium)
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5th Problem
(medium)
G. Lasry
19/01/18
. . . . . . . . . . .
6th Problem
(medium)
G. Lasry
19/01/18
. . . . . . . . . . .
7th Problem
(medium)
G. Lasry
19/01/18
. . . . . . . . . . .
8th Problem
(hard)
G. Lasry
19/01/18
. . . . . . . . . . .