From 547a6c5e1998fc0d2eece7207532fcdcdb3b6267 Mon Sep 17 00:00:00 2001
From: Richard Luhtaru <79766340+rluhtaru@users.noreply.github.com>
Date: Tue, 20 Dec 2022 00:54:05 +0100
Subject: [PATCH] Fix typo in Lecture 3

---
 lectures/lec03.tex | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lectures/lec03.tex b/lectures/lec03.tex
index 8d61cfe..56c9cf3 100644
--- a/lectures/lec03.tex
+++ b/lectures/lec03.tex
@@ -267,7 +267,7 @@ \subsection{Domain Separation}
 \paragraph{Bad idea.} An obvious solution to construct the two-input hash function $H_2$ 
 is to concatenate the two values, so that $H_2(x, y) = H(x || y)$.
 However, this construction allows two different pairs of messages to hash to the same value:
-\[ _2(\text{"key", "value"}) = H_2(\text{"ke", "yvalue"}).\]
+\[ H_2(\text{"key", "value"}) = H_2(\text{"ke", "yvalue"}).\]
 Both Amazon and Flickr had a bug arising from
 this---they concatenated all parameters before
 hashing, and had parameters such that two