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Erschienen in:
2012 | OriginalPaper | Buchkapitel
On the Security of Two Certificateless Signature Schemes
verfasst von : Young-Ran Lee
Erschienen in: Advances in Computer Science, Engineering & Applications
Verlag: Springer Berlin Heidelberg
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Recently, Xiao
$et \ al.$
proposed a strong designated verifier certificateless signature scheme. Zhang
$et \ al.$
claimed that Xiao
$et \ al.$
’s scheme is vulnerable to key replacement attacks. In this paper, we show that Zhang
$et \ al.$
’s cryptanalysis on Xiao
$et \ al.$
’s scheme is incorrect and Xiao
$et \ al.$
’s scheme is insecure against key replacement attacks. On the other hand, Li
$et \ al.$
proposed a certificateless signature scheme without
MapToPoint
. It is shown that an adversary who replaces the public key of a signer can forge valid signatures for that signer without knowledge of the signer’s private key.