'lamencrypt.pl'

This little script simulates a sort of weak encryption that I saw used by an old Win95 app to convert Registration info to garbage and back again. It stored the Company Name and address, etc., in Access database tables by the following method: The ASCII decimal value of each character of each string for a given field would be incremented by the place value from the left, starting with 1. For example, "asdf" would become "bugj". Anyway, I thought a worthy beginner's excercise in Perl might be to create a script that does the conversion. So here it is... 
#!/usr/bin/perl
# -u option performs the conversion in reverse

if (@ARGV && $ARGV[0] ne "-u") {
  print "\nInvalid option.\n";
  die "usage: lamencrypt.pl [option] (-u decrypts)\n";
}

print "\nEnter string to translate:     ";
chomp(my $input_string = <STDIN>);

my @user_input = split //, $input_string;
my $element = 0;
my $output_string;

foreach $user_input (@user_input){
        my $value = ord($user_input[$element]);
        my $uncounter = $element;            

        while ($uncounter >= 0) {
          if (@ARGV && $ARGV[0] =~ /-u/){
            $value--;
            $uncounter--;
          }
           else {
             $value++;
             $uncounter--;
           }
        }

        $element++;
        $output_string .= chr($value);

        }
while (length($output_string) > $element){
  chop($output_string);
}
print "\nLamely encrypted:              ";
print "$output_string\n";

[download]

In reply to Silly "encryption".....just for fun ;) by Guitarded

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