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Chosen-ciphertext secure multi-hop identity-based conditional proxy re-encryption with constant-size ciphertexts.
- Source :
-
Theoretical Computer Science . Jun2014, Vol. 539, p87-105. 19p. - Publication Year :
- 2014
-
Abstract
- Abstract: Proxy Re-Encryption (PRE) allows one user to delegate the decryption rights of his/her ciphertexts to another user. Since the introduction of Multi-Hop Identity-Based PRE (MH-IBPRE) by Green and Ateniese, the ciphertext size and the decryption complexity grow linearly in the number of re-encryption “hops”. In this paper, for the first time, we propose an MH-IBPRE that maintains the (constant) ciphertext size and computational complexity regardless of the number of re-encryption hops. Moreover, our scheme is bidirectional and also supports conditional re-encryption. The scheme is proven secure against selective identity and chosen-ciphertext attacks and collusion resistant in the standard model. As of independent interest, we also show that the conditional re-encryption can also be extended to a set of conditions. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 03043975
- Volume :
- 539
- Database :
- Academic Search Index
- Journal :
- Theoretical Computer Science
- Publication Type :
- Academic Journal
- Accession number :
- 96349059
- Full Text :
- https://doi.org/10.1016/j.tcs.2014.04.027