Cryptography Reference
In-Depth Information
and
01000
00010
00001
10000
00100
T
=
the inverse of the transposition matrix
T
.
E
XAMPLE
.
Here we encipher the message
BLOW ME DOWN
using the ordinary alphabet, a 3
3 substitution matrix, and a 4
4 transposition matrix.
Here, though, the transposition is done by taking
C
=
CT
, instead of
C
=
TC
.
Enciphering matrix:
7 19 22
a = 15 11 1
0 21 17
The inverse of the enciphering matrix modulo 26:
14 23 5
ainv = 7 21 5
25 23 0
The transposition matrix:
0 1 0 0
0 0 0 1
t =
1 0 0 0
0 0 1 0
The inverse of the transposition matrix:
0 0 1 0
1 0 0 0
0 0 0 1
0 1 0 0
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