KimeraPAD: A Novel Low-Overhead Real-Time Defense Against Website Fingerprinting Attacks Based on Deep Reinforcement Learning
Bibliographic record
Abstract
The onion router (Tor) is a network system for anonymous communication. However, website fingerprinting (WF) attacks have threatened the anonymity of Tor. WF attackers can passively monitor and collect traffic, classify the victims’ traffic based on machine learning or deep learning, and identify the websites the victims visit. In recent years, there has been some research on WF defense, but most of the works have high bandwidth and latency overhead. Besides, some defenses are criticized as being unrealistic to implement in real-time due to the need for prior knowledge of the traffic’s exact packet sequences, and the lengths of sequences. In this paper, we propose KimeraPAD, a defense against WF attacks based on deep reinforcement learning. Specifically, our method first trains an agent to generate perturbations confusing the attacker’s classifier. To overcome the weak point of WF defense based on adversarial learning, we then design the implementation method and incur randomness so that it can inject dummy packets in real time and resist adversarial training. Experimental results demonstrate that our method can greatly reduce attack accuracy with a low bandwidth overhead. Besides, KimeraPAD can also be implemented on the client side, which simplifies the implementation a lot while achieving excellent performance.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".