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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Improvement on Ahn et al.’s RSA P-Homomorphic Signature Scheme
verfasst von : Zhiwei Wang
Erschienen in: Security and Privacy in Communication Networks
Verlag: Springer Berlin Heidelberg
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P-homomorphic signature is a general framework for computing on authenticated data, which is recently proposed by Ahn et al. With P-homomorphic signature, any third party can derive a signature on the object message
m
′ from a signature of
m
, if
m
′ and
m
satisfy
P
(
m
,
m
′) = 1 for some predicate
P
which denotes the authenticatable relationship between
m
′ and
m
. Ahn et al. proposed a RSA P-homomorphic signature scheme by using a RSA accumulator, which is very efficient in space. However, the computational cost of verification and derivation is very heavy. We present an improved P-homomorphic signature scheme based on factoring problem. In our construction, the time efficiency of both verification and derivation are much better than Ahn’s scheme.