Reproduce “STAR: Semantic-Traffic Alignment and Retrieval for Zero-Shot HTTPS Website Fingerprinting” on OpenResearch

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About this paper

Yifei Cheng, Yujia Zhu, Baiyang Li, Xinhao Deng, Yitong Cai, Yaochen Ren, Qingyun Liu

STAR introduces a zero-shot HTTPS website fingerprinting method that reformulates the problem as a cross-modal retrieval task, aligning encrypted traffic patterns with crawl-time semantic website profiles. The system achieved 87.87% top-1 accuracy for identifying 1,600 unseen websites without prior labeled traffic and demonstrated robust open-world detection with an AUC of 0.963.

Key insights

  • "Semantic leakage" through encrypted traffic patterns, specifically the structural characteristics of website resource loading, remains a dominant privacy vulnerability despite advanced HTTPS mechanisms.
  • Encrypted traffic and semantic website profiles exhibit robust "alignment anchors," such as correlations between request packet lengths and URI sizes or cumulative response sizes and resource content volumes.
  • Website fingerprinting can be successfully reframed as a zero-shot cross-modal retrieval task, enabling the identification of websites without any prior labeled traffic data for those specific sites.

Summary by alphaXiv.

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