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    Anonymous Tokens with Public Metadata and Applications to Private Contact Tracing

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    2041871.pdf (1.548Mb)
    Date
    2022-10-22
    Author
    Silde, Tjerand
    Strand, Martin
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    Abstract
    Anonymous single-use tokens have seen recent applications in private Internet browsing and anonymous statistics collection. We develop new schemes in order to include public metadata such as expiration dates for tokens. This inclusion enables planned mass revocation of tokens without distributing new keys, which for natural instantiations can give 77 % and 90 % amortized traffic savings compared to Privacy Pass (Davidson et al., 2018) and DIT: De-Identified Authenticated Telemetry at Scale (Huang et al., 2021), respectively. By transforming the public key, we are able to append public metadata to several existing protocols essentially without increasing computation or communication. Additional contributions include expanded definitions, a more complete framework for anonymous single-use tokens and a description of how anonymous tokens can improve the privacy in dp3t-like digital contact tracing applications. We also extend the protocol to create efficient and conceptually simple tokens with both public and private metadata, and tokens with public metadata and public verifiability from pairings.
    URI
    http://hdl.handle.net/20.500.12242/3141
    DOI
    10.1007/978-3-031-18283-9_9
    Description
    Silde, Tjerand; Strand, Martin. Anonymous Tokens with Public Metadata and Applications to Private Contact Tracing. Lecture Notes in Computer Science (LNCS) 2022 ;Volum 13411. s. 179-199
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