how about this? offers 3-way "encryption"...
#!/usr/bin/perl
use warnings;
use strict;
use Getopt::Std;
my %opt;
usage() unless (getopts('rRcCaA', \%opt));
usage() unless @ARGV;
if($opt{'r'} || $opt{'R'}) {
while(<>) {
tr/a-zA-Z/n-za-mN-ZA-M/;
print;
}
} elsif($opt{'c'}) {
while(<>) {
tr/a-zA-Z/d-za-cD-ZA-C/;
print;
}
} elsif($opt{'C'}) {
while(<>) {
tr/d-za-cD-ZA-C/a-zA-Z/;
print;
}
} elsif($opt{'a'}) {
while(my $line = <>) {
@_ = split//, $line;
map { print ord($_), " "; } @_;
print "\n";
}
} elsif($opt{'A'}) {
while(my $line = <>) {
@_ = split/ /, $line;
map { print chr($_); } @_;
print "\n";
}
}
sub usage {
print << "__END__";
-c = encrypt with Caesar encryption
-C = decrypt from Caesar encryption
-r = encrypt with rot13
-R = decrypt from rot13
-a = encrypt to numerical equivalent
-A = decrypt back to ASCII
example using files:
perl $0 -r plain.txt
perl $0 -C encrypted.txt
example using STDIN:
perl $0 -r <ENTER, type text>
__END__
exit 1;
}
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