研究成果

国際会議

  • Designated Verifier Signature with Claimability
    著者
    K. Yamashita, K. Hara, Y. Watanabe, N. Yanai, and J. Shikata,
    会議名
    APKC 2023
    出版社
    ACM
    発行年
    2023
    To appear.
    Abstract

    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). This paper also shows the first formal reduction from DVS to ring signature, which has been folklore until now.