diff --git a/2015/input/2015_8.txt b/2015/input/2015_8.txt
new file mode 100644
index 0000000..3309605
--- /dev/null
+++ b/2015/input/2015_8.txt
@@ -0,0 +1,300 @@
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diff --git a/2015/lib/2015/8.ex b/2015/lib/2015/8.ex
new file mode 100644
index 0000000..cad6e1f
--- /dev/null
+++ b/2015/lib/2015/8.ex
@@ -0,0 +1,35 @@
+import AOC
+
+aoc 2015, 8 do
+  def decoded_difference(str, diff \\ 0)
+  def decoded_difference("", diff), do: diff
+  def decoded_difference(~S[\"] <> rest, diff), do: decoded_difference(rest, diff + 1)
+  def decoded_difference(~S[\\] <> rest, diff), do: decoded_difference(rest, diff + 1)
+  def decoded_difference(~S["] <> rest, diff), do: decoded_difference(rest, diff + 1)
+
+  def decoded_difference(<<(~S[\x]), _::binary-size(2), rest::binary>>, diff),
+    do: decoded_difference(rest, diff + 3)
+
+  def decoded_difference(<<_::binary-size(1), rest::binary>>, diff),
+    do: decoded_difference(rest, diff)
+
+  def encoded_difference(str, diff \\ 0)
+  def encoded_difference("", diff), do: diff + 2
+  def encoded_difference(~S["] <> rest, diff), do: encoded_difference(rest, diff + 1)
+  def encoded_difference(~s[\\] <> rest, diff), do: encoded_difference(rest, diff + 1)
+
+  def encoded_difference(<<_::binary-size(1), rest::binary>>, diff),
+    do: encoded_difference(rest, diff)
+
+  def p1 do
+    input_stream()
+    |> Stream.map(&decoded_difference/1)
+    |> Enum.sum()
+  end
+
+  def p2 do
+    input_stream()
+    |> Stream.map(&encoded_difference/1)
+    |> Enum.sum()
+  end
+end