Delegatability of an identity based strong designated verifier signature scheme
X Sun, J Li, H Yin, G Chen - Informatica, 2010 - content.iospress.com
X Sun, J Li, H Yin, G Chen
Informatica, 2010•content.iospress.com… In this paper, however, we show that the KGS scheme is actually delegatable. Both the
signer and the designated verifier can delegate their respective signing and simulation ability
to a third party by sending some partial information of their secret keys. The delegatability
holds if the Computational Diffie–Hellman (CDH) problem is hard in the underlying
group, which we assume naturally in almost all of pairing-based cryptographic schemes. …
signer and the designated verifier can delegate their respective signing and simulation ability
to a third party by sending some partial information of their secret keys. The delegatability
holds if the Computational Diffie–Hellman (CDH) problem is hard in the underlying
group, which we assume naturally in almost all of pairing-based cryptographic schemes. …
Abstract
In 2007, Kancharla et al. proposed an identity-based strong designated verifier signature (IBSDVS) scheme based on bilinear pairings, and claimed it unforgeable and non-delegatable. However, in this paper, we show that this scheme is actually delegatable.
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