diff --git a/references.bib b/references.bib
index 5ba09e2..fabb91c 100644
--- a/references.bib
+++ b/references.bib
@@ -139,7 +139,7 @@
 	booktitle = {Symposium on Security \& Privacy},
 	publisher = {IEEE},
 	year = {2017},
-	url = {http://www.ieee-security.org/TC/SP2017/papers/586.pdf},
+	url = {https://www.ieee-security.org/TC/SP2017/papers/586.pdf},
 }
 
 @article{Heydari2017a,
@@ -993,7 +993,7 @@
 	publisher = {ACM},
 	title = {{Cirripede}: Circumvention Infrastructure using Router Redirection with Plausible Deniability},
 	year = {2011},
-	url = {http://hatswitch.org/~nikita/papers/cirripede-ccs11.pdf},
+	url = {https://hatswitch.org/~nikita/papers/cirripede-ccs11.pdf},
 }
 
 @inproceedings{Houmansadr2013a,
@@ -1102,7 +1102,7 @@
 	journal = {American Political Science Review},
 	title = {How Censorship in {China} Allows Government Criticism but Silences Collective Expression},
 	year = {2012},
-	url = {http://gking.harvard.edu/files/censored.pdf},
+	url = {https://gking.harvard.edu/files/censored.pdf},
 }
 
 @inproceedings{Knockel2011a,
@@ -1148,7 +1148,7 @@
 	publisher = {IEEE},
 	title = {Extensive Analysis and Large-Scale Empirical Evaluation of {Tor} Bridge Discovery},
 	year = {2012},
-	url = {http://www.cs.uml.edu/~xinwenfu/paper/Bridge.pdf},
+	url = {https://www.cs.uml.edu/~xinwenfu/paper/Bridge.pdf},
 }
 
 @inproceedings{Liu2011a,
@@ -1402,7 +1402,7 @@
 	booktitle = {Foundations \& Practice of Security},
 	publisher = {Springer},
 	year = {2013},
-	url = {http://grothoff.org/christian/fps2013wachs.pdf},
+	url = {https://grothoff.org/christian/fps2013wachs.pdf},
 }
 
 @inproceedings{Wachs2014a,
@@ -1420,7 +1420,7 @@
 	booktitle = {USENIX Security Symposium},
 	publisher = {USENIX},
 	year = {2000},
-	url = {http://www.eecs.harvard.edu/~mema/courses/cs264/papers/waldman00publius.pdf},
+	url = {https://www.eecs.harvard.edu/~mema/courses/cs264/papers/waldman00publius.pdf},
 }
 
 @inproceedings{Waldman2001a,
@@ -1430,7 +1430,7 @@
 	publisher = {ACM},
 	year = {2001},
 	pages = {126--135},
-	url = {http://www.cs.nyu.edu/~waldman/tangler.ps},
+	url = {https://www.cs.nyu.edu/~waldman/tangler.ps},
 }
 
 @inproceedings{Wang2012a,
@@ -1439,7 +1439,7 @@
 	booktitle = {Computer and Communications Security},
 	publisher = {ACM},
 	year = {2012},
-	url = {http://hatswitch.org/~nikita/papers/censorspoofer.pdf},
+	url = {https://hatswitch.org/~nikita/papers/censorspoofer.pdf},
 }
 
 @inproceedings{Wang2013a,