Toggle Main Menu Toggle Search

Open Access padlockePrints

Attribute-Based Encryption without Key Cloning

Lookup NU author(s): Dr Siamak Fayyaz Shahandashti


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


In this work, we consider the problem of key cloning in attribute-based encryption schemes. We introduce a new type of attribute-based encryption scheme, called token-based attribute-based encryption (tk-ABE) that provides strong deterrence for key cloning, in the sense that delegation of keys reveals some personal information about the user. It also has the feature that a misbehaving user can be easily revoked. We formalise the security requirements for such a scheme in terms of indistinguishability of the ciphertexts and two new security requirements which we call uncloneability and privacy-preserving. We construct a privacy-preserving uncloneable token-based attribute-based encryption scheme based on Cheung and Newport’s ciphertext-policy attribute-based encryption scheme and prove the scheme satisfies the above three security requirements. We also introduce the notion of non-interactive uncloneable attribute-based encryption in order to remove the online token server in the tk-ABE. We then construct such a new scheme with provable security. It should be pointed out that, although our non-interactive scheme is token-free, the scheme does not have the capability to easily revoke users from the scheme. Hence, both types of schemes have their own merits of existence.

Publication metadata

Author(s): Hinek MJ, Jiang S, Safavi-Naini R, Shahandashti SF

Publication type: Article

Publication status: Published

Journal: International Journal of Applied Cryptography

Year: 2012

Volume: 2

Issue: 3

Pages: 250-270

ISSN (print): 1753-0563

ISSN (electronic): 1753-0571

Publisher: InderScience


DOI: 10.1504/IJACT.2012.045587


Altmetrics provided by Altmetric