#!/usr/bin/perl

use strict;

my @wheel1 = qw( 8 4 6 6 3 3 8 4 );
my @wheel2 = qw( 1 2 4 6 3 8 8 9 5 1 6 1 7 2 8 1 );
print "KEY:";
chomp(my $key = <STDIN>);
my @wheel3 = map(ord, split //, $key);

my $file = @ARGV[0];
$/ = undef;
print "OPENING $file\n";
open(IN, "$file") || die "painful death! (because there is no $file)";
my ($out);
my $plaintext = <IN>;
close(IN);
open(OUT, ">$file");

my @nums = map(ord, split //, $plaintext);

foreach (@nums) {
print "*";
my $x = @wheel1[0] + @wheel2[0] + @wheel3[0];

if (@ARGV[1] eq "-d") {
$out = $_ + $x;
} else {
$out = $_ - $x;
}
$out = chr $out;

print OUT $out;

push @wheel1, shift @wheel1;
push @wheel2, shift @wheel2;
print "\b";
}

[download]

In reply to Ximp by beretboy

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.