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[Keyword] claimability(1hit)

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  • Designated Verifier Signature with Claimability

    Kyosuke YAMASHITA  Keisuke HARA  Yohei WATANABE  Naoto YANAI  Junji SHIKATA  

     
    PAPER

      Pubricized:
    2023/10/05
      Vol:
    E107-A No:3
      Page(s):
    203-217

    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).