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Metadata Computer science Anonymity Encryption Scalability Computer security The Internet Limiting Server Cryptography World Wide Web Internet privacy Database Engineering Mechanical engineering

Nirvan Tyagi , Yossi Gilad , Derek Leung , Matei Zaharia , Nickolai Zeldovich ·

YOU? · · 2017 · Open Access · · DOI: https://doi.org/10.1145/3132747.3132783 · OA: W2763748542

Private communication over the Internet remains a challenging problem. Even if messages are encrypted, it is hard to deliver them without revealing metadata about which pairs of users are communicating. Scalable anonymity systems, such as Tor, are susceptible to traffic analysis attacks that leak metadata. In contrast, the largest-scale systems with metadata privacy require passing all messages through a small number of providers, requiring a high operational cost for each provider and limiting their deployability in practice.