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DTP Foundations Week #13

Week 13 of the deductionist training program.

Answer for cipher #3.


Answer cipher #3:

Now this is hard, not because it’s a hard cipher to break, but because to break it you’ll need creativity and you have to be able to see patterns. So instead of frequency analysis we use patterns to break this. This is a concealment cipher, this is meant to look like an ordinary game of chess.

Logic dictates that, if it would be a useful cipher it should be easy to encipher and decipher. That means that the chessboard probably plays a part in this cipher. Let’s try the first part.

d5 d2

c3 h2xa3

Ba7 b8xc1

a1 e4

e1 xNe1

Bc6 h3

If you we are aware that the English alphabet has 26 letters you will have it easier.

A = 1

B = 2

C = 3

D = 4

E = 5

F = 6

G = 7

H = 8

I = 9

J = 10

K = 11

L =12

M = 13

N = 14

O = 15

P = 16

Q = 17

R = 18

S = 19

T = 20

U = 21

V = 22

W = 23

X = 24

Y = 25

Z = 26

Now we try multiplying the first chess coordinate, so d(4) x 5 = 20 so that would be T. We go on. d(4) x 2 = 8 so that would be H and we continue.

T H

I h2xa3

Ba7 b8xc1

A T

E xNe1

Bc6 X


C O

e2xc1 E

b5xa3 E

Bc1 T

Ka2 xBa3

I F

Rg1 O

U a3xh2

U Ba1

C a1xa4

E Bb1

T d3xc1

Ba2 a3xa2

C Bg1

Nb1 H

c1xa2 R

This looks like a mess right now but start analysing the other parts. h2xa3, h(8) x 2 = 16 a(1) x 3 = 3. 16 x 3 is 48 so that won’t work. 16 + 3 = 19 so that’s S. b8xc1, b(2) x 8 = 16 c(3) x 1 = 3. 16 + 3 = 19 so that’s S. Continue doing this.

T H

I S

Ba7 S

A T

E xNe1

Bc6 X


C O

M E

M E

Bc1 T

Ka2 xBa3

I F

Rg1 O

U S

U Ba1

C E

E Bb1

T O

Ba2 E

C Bg1

Nb1 H

E R

Now this makes more sense but it’ll need a bit more work. Ba7, B(2) + a(1) x 7 = 9 which is I. xNe1, N(14) + e(5) x 1 = 19 which is S. Continue doing this.

T H

I S

I S

A T

E S

T X


C O

M E

M E

E T

M E

I F

Y O

U S

U C

C E

E D

T O

D E

C I

P H

E R

So this then becomes:

THISISATESTX COMEMEETMEIFYOUSUCCEEDTODECIPHER

Which is easier read as:

This is a test X. Come meet me if you succeed to decipher.

You decide to meet M again.


And with that, I’ll see you my irregulars.