a Caesar Cipher just substitutes each character for a fixed replacement. The easiest way to do that in Perl is with the tr operator:
my $original = lc "Ceterum censeo Carthaginem esse delendam";
my $cyphered = $original;
$cyphered =~ tr/a-z/k-za-j/;
my $decyphered = $cyphered;
$decyphered =~ tr/k-za-j/a-z/;
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