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The Tor network provides users with strong anonymity by routing their internet traffic through multiple relays. While Tor encrypts traffic and hides IP addresses, it remains vulnerable to traffic analysis attacks such as the website…

Cryptography and Security · Computer Science 2026-01-06 Yuwen Cui , Guangjing Wang , Khanh Vu , Kai Wei , Kehan Shen , Zhengyuan Jiang , Xiao Han , Ning Wang , Zhuo Lu , Yao Liu

Website fingerprinting (WF) attacks on Tor can infer user destinations from encrypted traffic metadata. However, their real-world effectiveness remains debated due to laboratory settings that fail to capture network fluctuations, evaluate…

Cryptography and Security · Computer Science 2026-03-10 Mohammadhamed Shadbeh , Khashayar Khajavi , Tao Wang

Website Fingerprinting (WF) attacks are used by local passive attackers to determine the destination of encrypted internet traffic by comparing the sequences of packets sent to and received by the user to a previously recorded data set. As…

Cryptography and Security · Computer Science 2021-09-23 James K Holland , Nicholas Hopper

Tor provides low-latency anonymous and uncensored network access against a local or network adversary. Due to the design choice to minimize traffic overhead (and increase the pool of potential users) Tor allows some information about the…

Cryptography and Security · Computer Science 2019-06-06 Shuai Li , Huajun Guo , Nicholas Hopper

While anonymity networks like Tor aim to protect the privacy of their users, they are vulnerable to traffic analysis attacks such as Website Fingerprinting (WF) and Flow Correlation (FC). Recent implementations of WF and FC attacks, such as…

Cryptography and Security · Computer Science 2023-09-26 James K Holland , Jason Carpenter , Se Eun Oh , Nicholas Hopper

Website fingerprinting (WF) is a dangerous attack on web privacy because it enables an adversary to predict the website a user is visiting, despite the use of encryption, VPNs, or anonymizing networks such as Tor. Previous WF work almost…

Cryptography and Security · Computer Science 2026-01-22 Rob Jansen , Ryan Wails , Aaron Johnson

Online anonymity and privacy has been based on confusing the adversary by creating indistinguishable network elements. Tor is the largest and most widely deployed anonymity system, designed against realistic modern adversaries. Recently,…

Cryptography and Security · Computer Science 2022-01-13 George Kadianakis , Theodoros Polyzos , Mike Perry , Kostas Chatzikokolakis

Anonymity systems like Tor are vulnerable to Website Fingerprinting (WF) attacks, where a local passive eavesdropper infers the victim's activity. Current WF attacks based on deep learning classifiers have successfully overcome numerous…

Cryptography and Security · Computer Science 2021-02-09 Shawn Shan , Arjun Nitin Bhagoji , Haitao Zheng , Ben Y. Zhao

Website fingerprinting enables a local eavesdropper to determine which websites a user is visiting over an encrypted connection. State-of-the-art website fingerprinting attacks have been shown to be effective even against Tor. Recently,…

Cryptography and Security · Computer Science 2018-08-21 Payap Sirinam , Mohsen Imani , Marc Juarez , Matthew Wright

Website Fingerprinting (WF) attacks raise major concerns about users' privacy. They employ Machine Learning (ML) to allow a local passive adversary to uncover the Web browsing behavior of a user, even if she browses through an encrypted…

Cryptography and Security · Computer Science 2017-12-08 Giovanni Cherubin

Website Fingerprinting (WF) attacks exploit patterns in encrypted traffic to infer the websites visited by users, posing a serious threat to anonymous communication systems. Although recent WF techniques achieve over 90% accuracy in…

Cryptography and Security · Computer Science 2025-10-17 Xinhao Deng , Jingyou Chen , Linxiao Yu , Yixiang Zhang , Zhongyi Gu , Changhao Qiu , Xiyuan Zhao , Ke Xu , Qi Li

Website Fingerprinting (WF) is considered a major threat to the anonymity of Tor users (and other anonymity systems). While state-of-the-art WF techniques have claimed high attack accuracies, e.g., by leveraging Deep Neural Networks (DNN),…

Cryptography and Security · Computer Science 2023-09-20 Alireza Bahramali , Ardavan Bozorgi , Amir Houmansadr

Website fingerprinting (WF) attacks remain a significant threat to encrypted traffic, prompting the development of a wide range of defenses. Among these, two prominent classes are regularization-based defenses, which shape traffic using…

Cryptography and Security · Computer Science 2026-03-11 Khashayar Khajavi , Tao Wang

Website Fingerprinting (WF) aims to deanonymize users on the Tor network by analyzing encrypted network traffic. Recent deep-learning-based attacks show high accuracy on undefended traces. However, they struggle against modern defenses that…

Cryptography and Security · Computer Science 2024-12-17 Jiajun Gong , Wei Cai , Siyuan Liang , Zhong Guan , Tao Wang , Ee-Chien Chang

Website Fingerprinting (WF) is a type of traffic analysis attack that enables a local passive eavesdropper to infer the victim's activity, even when the traffic is protected by a VPN or an anonymity system like Tor. Leveraging a…

Cryptography and Security · Computer Science 2022-11-15 Mohammad Saidur Rahman , Mohsen Imani , Nate Mathews , Matthew Wright

Website fingerprinting attacks enable an adversary to infer which website a victim is visiting, even if the victim uses an encrypting proxy, such as Tor. Previous work has shown that all proposed defenses against website fingerprinting…

Cryptography and Security · Computer Science 2014-01-24 Xiang Cai , Rishab Nithyanand , Rob Johnson

Website fingerprinting is an attack that uses size and timing characteristics of encrypted downloads to identify targeted websites. Since this can defeat the privacy goals of anonymity networks such as Tor, many algorithms to defend against…

Cryptography and Security · Computer Science 2022-08-08 Ethan Witwer , James Holland , Nicholas Hopper

Website fingerprinting (WF) is a well-know threat to users' web privacy. New internet standards, such as QUIC, include padding to support defenses against WF. Previous work only analyzes the effectiveness of defenses when users are behind a…

Cryptography and Security · Computer Science 2022-12-16 Sandra Siby , Ludovic Barman , Christopher Wood , Marwan Fayed , Nick Sullivan , Carmela Troncoso

Website fingerprinting attack is an extensively studied technique used in a web browser to analyze traffic patterns and thus infer confidential information about users. Several website fingerprinting attacks based on machine learning and…

Cryptography and Security · Computer Science 2023-02-28 Guodong Huang , Chuan Ma , Ming Ding , Yuwen Qian , Chunpeng Ge , Liming Fang , Zhe Liu

Tor is a low-latency anonymous communication network that protects user privacy by encrypting website traffic. However, recent website fingerprinting (WF) attacks have shown that encrypted traffic can still leak users' visited websites by…

Cryptography and Security · Computer Science 2026-03-24 Yuhao Pan , Wenchao Xu , Fushuo Huo , Haozhao Wang , Xiucheng Wang , Nan Cheng
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