3 files changed, 54 insertions, 0 deletions
diff --git a/challenge-045/dave-jacoby/blog.txt b/challenge-045/dave-jacoby/blog.txt
new file mode 100644
index 0000000000..2be6e34888
--- /dev/null
+++ b/challenge-045/dave-jacoby/blog.txt
@@ -0,0 +1 @@
+https://jacoby.github.io/2020/01/29/challenge-45-cyphers-and-quines.html
diff --git a/challenge-045/dave-jacoby/perl/ch-1.pl b/challenge-045/dave-jacoby/perl/ch-1.pl
new file mode 100644
index 0000000000..697a290942
--- /dev/null
+++ b/challenge-045/dave-jacoby/perl/ch-1.pl
@@ -0,0 +1,42 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use feature qw{ say postderef signatures };
+no warnings qw{ experimental::postderef experimental::signatures };
+
+use JSON;
+my $json = JSON->new;
+
+my $string = 'The quick brown fox jumps over the lazy dog';
+
+my $input = scalar @ARGV ? join ' ', @ARGV : $string;
+
+my $code = encypher($input);
+say $code;
+
+sub encypher ( $plaintext ) {
+    $plaintext = lc $plaintext;
+    $plaintext =~ s/[^a-z]//gmx;
+    my @work;
+
+    while ( length $plaintext >= 8 ) {
+        my $eight = substr $plaintext, 0, 8;
+        $plaintext =~ s/\w{8}//mix;
+        push @work, $eight;
+    }
+    push @work, $plaintext;
+
+    my @cyphertext;
+
+    for my $i ( 0 .. scalar @work - 1 ) {
+        my $word = $work[$i];
+        for my $j ( 0 .. length $word ) {
+            my $letter = substr $word, $j, 1;
+            next unless scalar $letter;
+            $cyphertext[$j][$i] = $letter;
+        }
+    }
+
+    return join ' ', map { join '', $_->@* } @cyphertext;
+}
diff --git a/challenge-045/dave-jacoby/perl/ch-2.pl b/challenge-045/dave-jacoby/perl/ch-2.pl
new file mode 100644
index 0000000000..387d32008e
--- /dev/null
+++ b/challenge-045/dave-jacoby/perl/ch-2.pl
@@ -0,0 +1,11 @@
+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+
+use Cwd qw{abs_path};
+
+my $file = abs_path($0);
+if ( -f $file && open my $fh, '<', $file ) {
+    print join '', <$fh>;
+}