Welcome to the resource topic for 2023/1319
Title:
On the Black-Box Separation Between Ring Signatures and Public Key Encryptions
Authors: Kyosuke Yamashita, Keisuke Hara
Abstract:In this paper, we show that it is impossible to construct a public key encryption scheme (PKE) from a ring signature scheme in a black-box fashion in the standard model. Such an impossibility is highly non-trivial because, to the best of our knowledge, known generic constructions of ring signature scheme are based on public key cryptosystems or in the random oracle model. Technically, we introduce a new cryptographic primitive named indistinguishable multi-designated verifiers signature (IMDVS), and prove that (i) IMDVS is equivalent to PKE, and (ii) it is impossible to construct IMDVS from a ring signature scheme in a generic way. Our result suggests an essential gap between ring signature and group signature, as it is known that group signature implies PKE.
ePrint: https://eprint.iacr.org/2023/1319
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