updates

content/CSE442T/CSE442T_L16.md

@@ -13,7 +13,8 @@ Ouput $(r,m\oplus f_i(r))$
 
 $Dec_i(r,c):$ Output $c\oplus f_i(r)$
 
-Proof of security:
+<details>
+<summary>Proof of security</summary>
 
 Suppose $D$ distinguishes, for infinitly many $n$.
 
@@ -35,7 +36,7 @@ $(r_1,F(r_1)),\ldots, (r_q,F(r_q))$
 
 So $D$ distinguishing output of $r_1,\ldots, r_q$ of PRF from the RF, this contradicts with definition of PRF.
 
-QED
+</details>
 
 Noe we have