研究成果

学術論文誌

  • Designated Verifier Signature with Claimability
    著者
    K. Yamahista, K. Hara, Y. Watanabe, N. Yanai, and J. Shikata
    雑誌名
    IEICE Transactions on Fundamentals
    E107-A
    1
    出版社
    IEICE
    発行年
    2024
    (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).