--- a/hws/hw07.tex	Thu Oct 22 20:19:27 2015 +0100
+++ b/hws/hw07.tex	Sun Oct 25 23:34:04 2015 +0000
@@ -10,6 +10,8 @@
 
 \item What is meant by the notion \emph{forward privacy}?
 
+\item What is a \emph{re-identification attack}?
+
 \item Imagine you have an completely `innocent' email message,
       like birthday wishes to your grandmother? Why should you
       still encrypt this message and your grandmother take the