Instantaneous Proxy-Based Key Update for CP-ABE
Loading...
Date
2016-11-07
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE
Abstract
Attribute Based Encryption (ABE) scheme has been
proposed to implement cryptographic fine grained access control
to shared information. It allows to achieve information sharing of
type one-to-many users, without considering the number of users
and their identities. However, original ABE systems suffer from
the non-efficiency of their attribute/key revocation mechanisms.
Based on Ciphertext-Policy ABE (CP-ABE) scheme, we pro-
pose an efficient proxy-based immediate private key update which
does require neither re-encrypting cipher-texts, nor affect other
users’ secret keys. The semi-trusted proxy, we have introduced,
assists nodes during the decryption process without having ability
to decrypt nodes’ data. Moreover, the proxy eliminates the 1-
effects-n phenomenon from which suffer existing solutions when
it comes to revoke nodes attributes.
Finally, we analyze the security of our scheme and demonstrate
that the proposed solution outperforms existing ones in terms of
generated overheard.
Description
Keywords
CP-ABE; Access Control; Pairing Cryptogra- phy; Attribute revocation;