For the cyphertest lookup try using the indexes of your arrays as keys. This should be speedy and cheaper from a memory standpoint.
Split your cyphertext 'letters' into two digits. Then create a list of list references.Something like this:
@ct[2,5,8]=['d', 'j', 'f', 'b', 'g', 'q', 'k', 's', 'r', 'l'];
print $ct[2][3]; # Should print b.
Warning:code untested as all get out.
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