Designated Verifier Signature with Claimability

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  • YAMASHITA Kyosuke
    Osaka University National Institute of Advanced Industrial Science and Technology (AIST)
  • HARA Keisuke
    National Institute of Advanced Industrial Science and Technology (AIST) Yokohama National University
  • WATANABE Yohei
    The University of Electro-Communications Japan Datacom Co., Ltd.
  • YANAI Naoto
    Osaka University Japan Datacom Co., Ltd.
  • SHIKATA Junji
    Yokohama National University

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<p>This paper considers the problem of balancing traceability and anonymity in designated verifier signatures (DVS), which are a kind of group-oriented signatures. That is, we propose claimable designated verifier signatures (CDVS), where a signer is able to claim that he/she indeed created a signature later. Ordinal DVS does not provide any traceability, which could indicate too strong anonymity. Thus, adding claimability, which can be seen as a sort of traceability, moderates anonymity. We demonstrate two generic constructions of CDVS from (i) ring signatures, (non-ring) signatures, pseudorandom function, and commitment scheme, and (ii) claimable ring signatures (by Park and Sealfon, CRYPTO'19).</p>

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