Relation between Verifiable Random Functions and Convertible Undeniable Signatures, and New Constructions
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概要
- 論文の詳細を見る
Verifiable random functions (VRF), proposed in 1999, and selectively convertible undeniable signature (SCUS) schemes, proposed in 1990, are apparently thought as independent primitives in the literature. In this paper, we show that they are tightly related in the following sense: VRF is exactly SCUS; and the reverse also holds true under a condition. This directly yields several deterministic SCUS schemes based on existing VRF constructions. In addition, we create a new probabilistic SCUS scheme, which is very compact. We build efficient confirmation and disavowal protocols for the proposed SCUS schemes, based on what we call zero-knowledge protocols for generalized DDH and non-DDH. These zero-knowledge protocols are built either sequential, concurrent, or universally composable.
- The Institute of Electronics, Information and Communication Engineersの論文
著者
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Kurosawa Kaoru
Department Of Behavioral Sciences Faculty Of Letters Chiba University
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PHONG Le
Security Fundamental Laboratory, Network Security Reseach Institute, NICT
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NOJIMA Ryo
Security Fundamental Laboratory, Network Security Reseach Institute, NICT
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