Add four S&P'25 papers.

ref: https://www.ieee-security.org/TC/SP2025/program.html.

Author: gfw-report

references.bib

@@ -1,3 +1,39 @@
+@inproceedings{Wu2025a,
+    author = {Mingshi Wu and Ali Zohaib and Zakir Durumeric and Amir Houmansadr and Eric Wustrow},
+    title = {A Wall Behind A Wall: Emerging Regional Censorship in {China}},
+    booktitle = {Symposium on Security \& Privacy},
+    publisher = {IEEE},
+    year = {2025},
+    url = {https://gfw.report/publications/sp25/data/paper/paper.pdf},
+}
+
+@inproceedings{Vafa2025a,
+    author = {Elham Pourabbas Vafa and Mohit Singhal and Poojitha Thota and Sayak Saha Roy},
+    title = {Learning from Censored Experiences: Social Media Discussions around Censorship Circumvention Technologies},
+    booktitle = {Symposium on Security \& Privacy},
+    publisher = {IEEE},
+    year = {2025},
+    url = {https://www.computer.org/csdl/pds/api/csdl/proceedings/download-article/21B7R7E8URG/pdf},
+}
+
+@inproceedings{Niere2025a,
+    author = {Niklas Niere and Felix Lange and Robert Merget and Juraj Somorovsky},
+    title = {Transport Layer Obscurity: Circumventing {SNI} Censorship on the {TLS} Layer},
+    booktitle = {Symposium on Security \& Privacy},
+    publisher = {IEEE},
+    year = {2025},
+    url = {https://www.computer.org/csdl/pds/api/csdl/proceedings/download-article/26hiUekZ19S/pdf},
+}
+
+@inproceedings{Nourin2025a,
+    author = {Sadia Nourin and Erik Rye and Kevin Bock and Nguyen Phong Hoang and Dave Levin},
+    title = {Is Nobody There? Good! Globally Measuring Connection Tampering without Responsive Endhosts},
+    booktitle = {Symposium on Security \& Privacy},
+    publisher = {IEEE},
+    year = {2025},
+    url = {https://www.computer.org/csdl/pds/api/csdl/proceedings/download-article/26hiUgw654A/pdf},
+}
+
 @inproceedings{Fan2025a,
 	author = {Shencha Fan and Jackson Sippe and Sakamoto San and Jade Sheffey and David Fifield and Amir Houmansadr and Elson Wedwards and Eric Wustrow},
 	title = {{Wallbleed}: A Memory Disclosure Vulnerability in the {Great Firewall} of {China}},