Circular Transitivity of a Bidirectional Proxy Re-Encryption Scheme

Autor:	Xiao Jing Hong, Bin Wang
Rok vydání:	2013
Předmět:	Transitive relation Theoretical computer science Pairing General Medicine Proxy (statistics) Proxy re-encryption Formal description Random oracle Mathematics
Zdroj:	Applied Mechanics and Materials. :2639-2642
ISSN:	1662-7482
DOI:	10.4028/www.scientific.net/amm.321-324.2639
Popis:	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 als 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2c3fa2137f2db2f7eceaf7335ecaf91a https://doi.org/10.4028/www.scientific.net/amm.321-324.2639 Zobrazit plný text záznamu