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RE: Cheesy Encryption

by Anonymous Monk
on Jun 15, 2000 at 23:32 UTC ( #18372=note: print w/ replies, xml ) Need Help??


in reply to Cheesy Encryption

Another way to do it:

#!/usr/bin/perl -sp
BEGIN {
        if ($h) {
                print <<"USAGE";
Usage: caesar: $0 -c filename
        rot13: $0 filename
USAGE
                exit;
        }
}
 
if( $c ) {
        tr/A-Za-z/D-ZA-Cd-za-c/;
} else {
        tr/A-Za-z/N-ZA-Mn-za-m/;
}


Comment on RE: Cheesy Encryption
Re: RE: Cheesy Encryption
by phenom (Chaplain) on Dec 31, 2003 at 18:41 UTC
    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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