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Erschienen in:
2014 | OriginalPaper | Buchkapitel
Cryptanalysis of Unidirectional Proxy Re-Encryption Scheme
verfasst von : Kunwar Singh, C. Pandu Rangan, A. K. Banerjee
Erschienen in: Information and Communication Technology
Verlag: Springer Berlin Heidelberg
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At Eurocrypt 1998, Blaze, Bleumer and Strauss [7]presented a new primitive called Proxy Re-Encryption (
PRE
). This new primitive allows semi trusted proxy to transform a ciphertext for Alice (delegator) into a ciphertext for Bob (delegatee) without knowing the message. Ateniese et al [6] introduced
master secret security
as another security requirement for unidirectional
PRE
.
Master secret security
demands that no coalition of dishonest proxy and malicious delegatees can compute the master secret key (private key) of the delegator. In this paper, first we have shown that Aono et al’s scheme [4] is not secure under
master secret security
model. In other words if proxy and delegatee collude they can compute the private key of the delegator. Second, based on Aono et al’s paper [4] we have constructed unidirectional
PRE
which is also secure under
master secret security
model. Like [4], our scheme is also multi-use.