Here's how to make it preserve case. The example is only for ROT-13, as you should be able to figure out the rest. First, remove the tr/A-Z/a-z/: 
if ($type eq 'r'( {
    $text =~ tr/N-ZA-Mn-za-m/A-Za-z/;
}

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In reply to RE: Cheesy Encryption by chromatic
in thread Cheesy Encryption by ergowolf

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