diff --git a/day04/input b/day04/input
new file mode 100644
index 0000000..d75e0dc
--- /dev/null
+++ b/day04/input
@@ -0,0 +1 @@
+yzbqklnj
diff --git a/day04/solution.rb b/day04/solution.rb
new file mode 100644
index 0000000..11d809e
--- /dev/null
+++ b/day04/solution.rb
@@ -0,0 +1,25 @@
+#!/bin/env ruby
+require 'digest'
+
+key = File.read('./input').strip
+# Part 1
+answer = false
+num = 0
+until answer
+  num += 1
+  answer = true if Digest::MD5.hexdigest(key + num.to_s)[0..4] == '00000'
+end
+
+puts 'Part 1 Solution is: ' + num.to_s
+puts "md5sum is: #{Digest::MD5.hexdigest(key + num.to_s)}"
+
+# Part 2
+answer = false
+num = 0
+until answer
+  num += 1
+  answer = true if Digest::MD5.hexdigest(key + num.to_s)[0..5] == '000000'
+end
+
+puts 'Part 2 Solution is: ' + num.to_s
+puts "md5sum is: #{Digest::MD5.hexdigest(key + num.to_s)}"