Censors Delay in Blocking Circumvention Proxies David Fifield & - PowerPoint PPT Presentation

Jul 03, 2023 •350 likes •577 views

Censors Delay in Blocking Circumvention Proxies David Fifield & Lynn Tsai University of California, Berkeley Tor (The Onion Router) Anonymous network Poorly suited for censorship circumvention Including bridges + pluggable transports

Censors’ Delay in Blocking Circumvention Proxies David Fifield & Lynn Tsai University of California, Berkeley
Tor (The Onion Router) Anonymous network Poorly suited for censorship circumvention Including bridges + pluggable transports Unlisted nodes that are difficult to discover Default bridges
Internet Censors and Circumvention Proxy Servers Length of delay Not intuitive Methods of discovery
Internet Censors and Circumvention Proxy Servers Length of delay Not intuitive Methods of discovery
Methodology Script that probes bridges to test for reachability China, Iran, US
Results Number of days it took to block Orbot Blocking time of day
Results Number of days it took to block Orbot Blocking time of day
Blocking Time of Day Graph
Rates of Reachability Graph
Further Questions and Steps Bridge address discovery Blocking delay is on the order of days Traceroutes Other countries
Further Questions and Steps Bridge address discovery Blocking delay is on the order of days Traceroutes Other countries https://www.bamsoftware.com/proxy-probe/
Thanks! Percy Alpha Nima Fatemi Linus Nordberg Henry de Valence & Others who choose to stay anonymous

Recommend

Delay Aware Packet Scheduling (DAPS) and receivers buffer blocking in CMT-SCTP Nicolas KUHN 1 ,

Window blocking issues and maximum blocking time Delay Aware Packet Scheduling Conclusion Delay Aware Packet Scheduling (DAPS) and receivers buffer blocking in CMT-SCTP Nicolas KUHN 1 , 2 , Golam SARWAR 2 , Emmanuel LOCHIN 1 , Roksana BORELI

555 views • 13 slides

Examining How The Great Firewall Discovers Hidden Circumvention Servers Roya Ensafi , David

Examining How The Great Firewall Discovers Hidden Circumvention Servers Roya Ensafi , David Fifield, Philipp Winter, Nick Feamster, Nicholas Weaver, and Vern Paxson Oct 29, 2015 1 Circumventing Internet Censorship Using Proxies Web servers

641 views • 41 slides

Data Blocking Jon K. Nilsen Department of Physics and Scientific Computing Group University of

Data Blocking Jon K. Nilsen Department of Physics and Scientific Computing Group University of Oslo, N-0316 Oslo, Norway Spring 2008 Computational Physics II FYS4410 Outline Data Blocking Why blocking? What is blocking? Blocking in

626 views • 14 slides

Interconnect Gate delay Wire delay The delay in VLSI circuits have two components Gate delay (

Advanced Digital IC-Design Propagation Delay Lumped C p Distributed model C model Interconnect Gate delay Wire delay The delay in VLSI circuits have two components Gate delay ( t pHL / t pLH ) Wire (interconnect) delay ( t w ) The Wire

492 views • 20 slides

Blocking in the 2 k Design Blocking may be required because: we cannot perform all required runs

ST 516 Experimental Statistics for Engineers II Blocking in the 2 k Design Blocking may be required because: we cannot perform all required runs under homogeneous conditions; e.g. raw material comes in limited batches; we want to carry out runs

487 views • 23 slides

1 Executive Summary Database Proxies: Improves SQL read/write performance and

1 Executive Summary Database Proxies: Improves SQL read/write performance and reliability Deployment requires no application changes Demo 2 IMDG vs. Database Proxies Feature ProxySQL Automated Failover

335 views • 17 slides

Data Blocking Jon K. Nilsen Department of Physics and Scientific Computing Group University of

210 views • 8 slides

Metaprogramming & JavaScript Object Proxies What is metaprogramming ? Writing programs that

C152 Programming Language Paradigms Prof. Tom Austin, Fall 2014 Metaprogramming & JavaScript Object Proxies What is metaprogramming ? Writing programs that manipulate other programs. JavaScript Proxies Special metaprogramming

594 views • 24 slides

Blocking and Non-blocking Checkpointing and Rollback Recovery for Networks-on-Chip Claudia Rusu 1

Blocking and Non-blocking Checkpointing and Rollback Recovery for Networks-on-Chip Claudia Rusu 1 , Cristian Grecu 2 , Lorena Anghel 1 1 TIMA Laboratory, CNRS-UJF-INP, Grenoble, France 2 SoC Laboratory, University of British Columbia, Vancouver,

700 views • 23 slides

Chipping Away at Censorship with User-Generated Content Sam Burnett, Nick Feamster and Santosh

Chipping Away at Censorship with User-Generated Content Sam Burnett, Nick Feamster and Santosh Vempala Internet Censorship is a Problem 12 censors 11 monitors More on the way Some censors have fastest growth in Internet usage

626 views • 43 slides

Shoddy Spares Customer Circumvention 18-849b Dependable Embedded Systems John DeVale April 1,

Shoddy Spares Customer Circumvention 18-849b Dependable Embedded Systems John DeVale April 1, 1999 (no kidding) Overview: Shoddy Spares, Customer Circumvention N Introduction Any design should take into consideration a customers desire

316 views • 10 slides

RC delay 4: The Elmore delay - 3 Application of the Elmore delay formula to a (RC) wire. Let R

RC delay 4: The Elmore delay - 3 Application of the Elmore delay formula to a (RC) wire. Let R , C , and l be the total line resistance, capacitance, and length. = = = / ; / ; / r R l c C l L l N N ( ) ( ) ( ) 2

653 views • 16 slides

P Packet Scheduling: k S h d li E d t End-to-End Delay Bounds E d D l B d Delay bounds

P Packet Scheduling: k S h d li E d t End-to-End Delay Bounds E d D l B d Delay bounds (Simon S. Lam) 1 2/7/2017 1 References References Delay Guarantee of Virtual Clock server Geoffrey G. Xie and Simon S. Lam, Delay

696 views • 43 slides

11 Introduction Introduction M/M/1 Queueing delay (revisited) R=link bandwidth (bps)

Introduction Introduction Four sources of packet delay Delay in packet-switched networks 3. Transmission delay: 4. Propagation delay: 1. nodal processing: 2. queueing R=link bandwidth (bps) d = length of physical link check

185 views • 3 slides

Outline Introduction Delay Test Issues Our Solutions Improved Launch Delay

DESIGN FOR AT-SPEED DELAY TEST Youhua Shi Information Technology Research Organization Waseda University Outline Introduction Delay Test Issues Our Solutions Improved Launch Delay Testing Power-aware Test Technique

450 views • 10 slides

Metaprogramming & JavaScript Object Proxies Prof. Tom Austin San Jos State University

CS 152: Programming Language Paradigms Metaprogramming & JavaScript Object Proxies Prof. Tom Austin San Jos State University What is metaprogramming ? Writing programs that manipulate other programs. JavaScript Proxies

380 views • 27 slides

Tor and circumvention: Lessons learned Nick Mathewson The Tor Project https://torproject.org/

Tor and circumvention: Lessons learned Nick Mathewson The Tor Project https://torproject.org/ 1 What is Tor? Online anonymity 1) open source software, 2) network, 3) protocol Community of researchers, developers, users, and relay operators

1.03k views • 68 slides

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/ 1 What is Tor? Online anonymity 1) open source software, 2) network, 3) protocol Community of researchers, developers, users, and relay

975 views • 68 slides

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/ 1 What is Tor? Online anonymity 1) software, 2) network, 3) protocol Open source, freely available Community of researchers,

661 views • 65 slides

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/

886 views • 54 slides

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/

1.04k views • 56 slides

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/ 1 Today's plan 0) Crash course on Tor 1) History of Tor censorship attempts 2) Attacks on low-latency anonymity 3) Tor performance

1.36k views • 101 slides

VERIFIABLE DELAY FUNCTIONS Benjamin Wesolowski VERIFIABLE DELAY FUNCTIONS How to slow things

Confrence de lancement de l'ANR Ciao, Fvrier 2020, Bordeaux, France VERIFIABLE DELAY FUNCTIONS Benjamin Wesolowski VERIFIABLE DELAY FUNCTIONS How to slow things down VERIFIABLE DELAY FUNCTIONS [Boneh, Bonneau, Bnz, Fisch 2018] A VDF is

616 views • 32 slides

Non-Blocking Two Phase Commit (2PC) Using Blockchain Paul Ezhilchelvan , Amjad Aldweesh and Aad

Non-Blocking Two Phase Commit (2PC) Using Blockchain Paul Ezhilchelvan , Amjad Aldweesh and Aad van Moorsel School of Computing, Newcastle University, UK Contributions Non-blocking 2PC in a synchronous database system Impossible when the

631 views • 12 slides

Censors Delay in Blocking Circumvention Proxies David Fifield & - PowerPoint PPT Presentation

Censors Delay in Blocking Circumvention Proxies David Fifield & Lynn Tsai University of California, Berkeley Tor (The Onion Router) Anonymous network Poorly suited for censorship circumvention Including bridges + pluggable transports

Delay Aware Packet Scheduling (DAPS) and receivers buffer blocking in CMT-SCTP Nicolas KUHN 1 ,

Examining How The Great Firewall Discovers Hidden Circumvention Servers Roya Ensafi , David

Data Blocking Jon K. Nilsen Department of Physics and Scientific Computing Group University of

Interconnect Gate delay Wire delay The delay in VLSI circuits have two components Gate delay (

Blocking in the 2 k Design Blocking may be required because: we cannot perform all required runs

1 Executive Summary Database Proxies: Improves SQL read/write performance and

Data Blocking Jon K. Nilsen Department of Physics and Scientific Computing Group University of

Metaprogramming &amp; JavaScript Object Proxies What is metaprogramming ? Writing programs that

Blocking and Non-blocking Checkpointing and Rollback Recovery for Networks-on-Chip Claudia Rusu 1

Chipping Away at Censorship with User-Generated Content Sam Burnett, Nick Feamster and Santosh

Shoddy Spares Customer Circumvention 18-849b Dependable Embedded Systems John DeVale April 1,

RC delay 4: The Elmore delay - 3 Application of the Elmore delay formula to a (RC) wire. Let R

P Packet Scheduling: k S h d li E d t End-to-End Delay Bounds E d D l B d Delay bounds

11 Introduction Introduction M/M/1 Queueing delay (revisited) R=link bandwidth (bps)

Outline Introduction Delay Test Issues Our Solutions Improved Launch Delay

Metaprogramming &amp; JavaScript Object Proxies Prof. Tom Austin San Jos State University

Tor and circumvention: Lessons learned Nick Mathewson The Tor Project https://torproject.org/

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/

Tor and circumvention: Lessons learned Roger Dingledine The Tor Project https://torproject.org/

VERIFIABLE DELAY FUNCTIONS Benjamin Wesolowski VERIFIABLE DELAY FUNCTIONS How to slow things

Non-Blocking Two Phase Commit (2PC) Using Blockchain Paul Ezhilchelvan , Amjad Aldweesh and Aad

Metaprogramming & JavaScript Object Proxies What is metaprogramming ? Writing programs that

Metaprogramming & JavaScript Object Proxies Prof. Tom Austin San Jos State University