Cryptography Reference
In-Depth Information
FIGURE 7.1
There is an applet called TestRandomModSquareMatrixApplet which can be found on
the topic's website. It generates random invertible matrices for a specified size, and modu-
lus. Pressing a button allows you to invert the matrix. A screen shot of this applet is shown
in Figure 7.1.
7.2
TRANSPOSITION CIPHERS
As you recall, transposition ciphers simply permute the characters in a plaintext message.
Matrices provide us with a convenient way of specifying permutations for this purpose.
Thus, we make the following definition:
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