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Hong X.J.,Yangzhou Jianghai Polytechnic College | Wang B.,Yangzhou University
Applied Mechanics and Materials | Year: 2013

The concept of proxy re-encryption (PRE) was first introduced by Blaze et al. Since then several CCA secure PRE schemes have been presented. Weng et al. proposed a non-transitive bidirectional PRE scheme without pairings and proved that their scheme to be PRE-CCA secure in the random oracle model under the CDH assumption. However, we show that Weng et al's non-transitive scheme is still transitive under the formal definition of non-transitivity presented in this paper. Moreover, the transitivity of Weng et al.'s scheme also implies that it is not PRE-CCA secure. © (2013) Trans Tech Publications, Switzerland. Source

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