Actually, the Everything Engine (last time I checked) doesn't encrypt passwords at all.

Assuming you keep your database properly secured, that shouldn't be a problem. Otherwise, you'll need a two-way encryption scheme, maybe a rotation cipher?

my $password = "foobar+";
my $salt = 11;
my $newpass = "";

sub encrypt {
    my $password = shift;
    my @letters = split '', $password;
    foreach my $letter (@letters) {
        my $value = ord($letter) + $salt;
        while ($value > 255) {
            $value -= 255;
        }
        $newpass .= chr($value);
    }
}

sub decrypt {
    my $password = shift;
    my @letters = split '', $password;
    foreach my $letter (@letters) {
        my $value = ord($letter) - $salt;
                while ($value < 0) {
                        $value += 255; 
            }
        $newpass .= chr($value);
    }
}
[download]

Not very secure, but better than plain text, if you keep your salt hidden. Keep your database more secure.