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262

Book Five

Ch. 18.

Chapter XVIII
On Arificial Inverted Transposition

We have had the Simple Mode;  we come now to the Artificial Mode, so called because, in the interior table, instead of two letters of the secret, one Transpositive letter has been artificially inserted; which letter afterwards, in order that the reader may be able to hunt down the two letters of the secret symbolized thereby, takes into union with itself a second letter from the exterior capital alphabet.  For, inasmuch  as each letter of the interior alphabet occurs twenty-one times, the person to whom the epistle is sent would be unable to extract any sense from the writing, should the letter of the exterior alphabet not be added as a key.  A table of this sort has been constructed by de Vigenere, pp.49b, 50a, b, 156b, and 188a, b.

 

 

O

P

Q

R

S

T

V

X

Z

A

B

C

D

E

F

G

H

I

L

M

N

 

 

E

F

G

H

I

L

M

N

O

P

Q

R

S

T

V

X

Z

A

B

C

D

O

E

a

b

c

d

e

f

g

h

i

l

m

n

o

p

q

r

s

t

v

x

z

P

F

b

c

d

e

f

g

h

i

l

m

n

o

p

q

r

s

t

v

x

z

a

Q

G

c

d

e

f

g

h

i

l

m

n

o

p

q

r

s

t

v

x

z

a

b

R

H

d

e

f

g

h

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l

m

n

o

p

q

r

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t

v

x

z

a

b

c

S

I

e

f

g

h

i

l

m

n

o

p

q

r

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t

v

x

z

a

b

c

d

T

L

f

g

h

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l

m

n

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p

q

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t

v

x

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a

b

c

d

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V

M

g

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a

b

c

d

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f

X

N

h

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p

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v

x

z

a

b

c

d

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f

g

Z

O

i

l

m

n

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p

q

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a

b

c

d

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f

g

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A

P

l

m

n

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p

q

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v

x

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a

b

c

d

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f

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i

B

Q

m

n

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p

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a

b

c

d

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f

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i

l

C

R

m

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p

q

r

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t

v

x

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a

b

c

d

e

f

g

h

i

l

m

D

S

o

p

q

r

s

t

v

x

z

a

b

c

d

e

f

g

h

i

l

m

n

E

T

p

q

r

s

t

v

x

z

a

b

c

d

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f

g

h

i

l

m

n

o

F

V

q

r

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t

v

x

z

a

b

c

d

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f

g

h

i

l

m

n

o

p

G

X

r

s

t

v

x

z

a

b

c

d

e

f

g

h

i

l

m

n

o

p

q

H

Z

s

t

v

x

z

a

b

c

d

e

f

g

h

i

l

m

n

o

p

q

r

I

A

t

v

x

z

a

b

c

d

e

f

g

h

i

l

m

n

o

p

q

r

s

L

B

v

x

z

a

b

c

d

e

f

g

h

i

l

m

n

o

p

q

r

s

t

M

C

x

z

a

b

c

d

e

f

g

h

i

l

m

n

o

p

q

r

s

t

v

N

D

z

a

b

c

d

e

f

g

h

i

l

m

n

o

p

q

r

s

t

v

x

This table likewise is composed of three alphabets, as is that presented in c. 16 (see, above, c.16, the line “The table consists of etc.); with this difference, however, that,