Add two USENIX Security'18 papers.

Changelog.txt

@@ -1,3 +1,7 @@
+* 2018-08-21
+	- Added paper ``Effective Detection of Multimedia Protocol Tunneling using Machine Learning''
+	- Added paper ``Quack: Scalable Remote Measurement of Application-Layer Censorship''
+
 * 2018-08-20
 	- Added paper ``Analyzing China's Blocking of Unpublished Tor Bridges''
 	- Added paper ``MultiFlow: Cross-Connection Decoy Routing using TLS 1.3 Session Resumption''

header.tpl

@@ -83,7 +83,7 @@
       (<a href="author_reverse.html">reverse</a>) <a href="author.html">author</a> <br />
       Feedback: <a href="mailto:phw@nymity.ch">phw@nymity.ch</a> (<a
       href="https://nymity.ch/openpgp_public_key.txt">OpenPGP</a>) <br />
-      Last updated: <a href="Changelog.txt">2018-08-20</a> <br />
+      Last updated: <a href="Changelog.txt">2018-08-21</a> <br />
       Onion site: <a href="http://3wcwjjnuvjyazeza.onion">3wcwjjnuvjyazeza.onion</a> <br />
       Code: <a href="https://github.com/NullHypothesis/censorbib">GitHub</a>
     </div>

references.bib

@@ -1,3 +1,21 @@
+@inproceedings{Barradas2018a,
+	author = {Diogo Barradas and Nuno Santos and Lu\'{i}s Rodrigues},
+	title = {Effective Detection of Multimedia Protocol Tunneling using Machine Learning},
+	booktitle = {USENIX Security Symposium},
+	publisher = {USENIX},
+	year = {2018},
+	url = {https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-barradas.pdf},
+}
+
+@inproceedings{VanderSloot2018a,
+	author = {Benjamin VanderSloot and Allison McDonald and Will Scott and J. Alex Halderman and Roya Ensafi},
+	title = {{Quack}: Scalable Remote Measurement of Application-Layer Censorship},
+	booktitle = {USENIX Security Symposium},
+	publisher = {USENIX},
+	year = {2018},
+	url = {https://www.usenix.org/system/files/conference/usenixsecurity18/sec18-vandersloot.pdf},
+}
+
 @inproceedings{Nisar2018a,
 	author = {Aqib Nisar and Aqsa Kashaf and Ihsan Ayyub Qazi and Zartash Afzal Uzmi},
 	title = {Incentivizing Censorship Measurements via Circumvention},