Welcome to the resource topic for 2004/102
Title:
The Exact Security of an Identity Based Signature and its Applications
Authors: Benoît Libert, Jean-Jacques Quisquater
Abstract:This paper first positively answers the previously open question
of whether it was possible to obtain an optimal security reduction
for an identity based signature (IBS) under a reasonable
computational assumption. We revisit the Sakai-Ogishi-Kasahara IBS
that was recently proven secure by Bellare, Namprempre and Neven
through a general framework applying to a large family of schemes.
We show that their modified SOK-IBS scheme can be viewed as a
one-level instantiation of Gentry and Silverberg’s alternative
hierarchical IBS the exact security of which was never considered
before. We also show that this signature is as secure as the
one-more Diffie-Hellman problem. As an application, we propose a
modification of Boyen’s “Swiss Army Knife” identity based
signature encryption (IBSE) that presents better security
reductions and
satisfies the same strong security requirements with a similar efficiency.
ePrint: https://eprint.iacr.org/2004/102
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