S. Basso (Open Observatory of Network Interference)

We designed DNSCheck, an active network experiment to detect the blocking of DoT/DoH services. We implemented DNSCheck into OONI Probe, the network-interference measurement tool we develop since 2012. We compiled a list of popular DoT/DoH services and ran DNSCheck measurements with help from volunteer OONI Probe users. We present preliminary results from measurements in Kazakhstan (AS48716), Iran (AS197207), and China (AS45090). We tested 123 DoT/DoH services, corresponding to 461 TCP/QUIC endpoints. We found endpoints to fail or succeed consistently. In AS197207 (Iran), 50% of the DoT endpoints seem blocked. Otherwise, we found that more than 80% of the tested endpoints were always reachable. The most frequently blocked services are Cloudflare’s and Google’s. In most cases, attempting to reach blocked endpoints failed with a timeout. We observed timeouts connecting, during, and after the TLS handshake. TLS blocking depends on either the SNI or the destination endpoint.

View More Papers

ALchemist: Fusing Application and Audit Logs for Precise Attack...

Le Yu (Purdue University), Shiqing Ma (Rutgers University), Zhuo Zhang (Purdue University), Guanhong Tao (Purdue University), Xiangyu Zhang (Purdue University), Dongyan Xu (Purdue University), Vincent E. Urias (Sandia National Laboratories), Han Wei Lin (Sandia National Laboratories), Gabriela Ciocarlie (SRI International), Vinod Yegneswaran (SRI International), Ashish Gehani (SRI International)

Read More

Oblivious DNS over HTTPS (ODoH): A Practical Privacy Enhancement...

Sudheesh Singanamalla*†, Suphanat Chunhapanya*, Jonathan Hoyland*, Marek Vavruša*, Tanya Verma*, Peter Wu*, Marwan Fayed*, Kurtis Heimerl†, Nick Sullivan*, Christopher Wood* (*Cloudflare Inc. †University of Washington)

Read More

WATSON: Abstracting Behaviors from Audit Logs via Aggregation of...

Jun Zeng (National University of Singapore), Zheng Leong Chua (Independent Researcher), Yinfang Chen (National University of Singapore), Kaihang Ji (National University of Singapore), Zhenkai Liang (National University of Singapore), Jian Mao (Beihang University)

Read More