diff --git a/exam/ex.tex b/exam/ex.tex
index 52c7295..735e457 100644
--- a/exam/ex.tex
+++ b/exam/ex.tex
@@ -175,7 +175,10 @@
   \item \textbf{(17 points)} 
   \begin{enumerate}
 
-    \item \TODO
+    \item LEDAcrypt is a post-quantum asymmetric suite of cryptosystems. It
+      contains a public-key encryption scheme and a key-encapsulation mechanism
+      (KEM). The underlying hard problem (arbitrary linear binary code decoding)
+      is currently believed to be secure against quantum adversaries. 
 
     \item \TODO