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Time-Based Direct Revocable Ciphertext-Policy Attribute-Based Encryption with Short Revocation List

Liu, Joseph K., Yuen, Tsz Hon, Zhang, Peng and Liang, Kaitai (2018) Time-Based Direct Revocable Ciphertext-Policy Attribute-Based Encryption with Short Revocation List In: 16th International Applied Cryptography and Network Security Conference (ACNS 2018), 02-04 Jul 2018, Leuven, Belgium.

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Abstract

In this paper, we propose an efficient revocable Ciphertext-Policy Attribute-Based Encryption (CP-ABE) scheme. We base on the direct revocation approach, by embedding the revocation list into ciphertext. However, since the revocation list will grow longer as time goes by, we further leverage this by proposing a secret key time validation technique so that users will have their keys expired on a date and the revocation list only needs to include those user keys revoked before their intended expired date (e.g. those user keys which have been stolen before expiry). These keys can be removed from the revocation list after their expiry date in order to keep the revocation list short, as these keys can no longer be used to decrypt ciphertext generated after their expiry time. This technique is derived from Hierarchical Identity-based Encryption (HIBE) mechanism and thus time periods are in hierarchical structure: year, month, day. Users with validity of the whole year can decrypt any ciphertext associated with time period of any month or any day within the year. By using this technique, the size of public parameters and user secret key can be greatly reduced. A bonus advantage of this technique is the support of discontinuity of user validity (e.g. taking no-paid leave).

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Computer Science
Authors :
NameEmailORCID
Liu, Joseph K.
Yuen, Tsz Hon
Zhang, Peng
Liang, Kaitaik.liang@surrey.ac.uk
Date : 10 June 2018
DOI : 10.1007/978-3-319-93387-0_27
Depositing User : Clive Harris
Date Deposited : 23 Sep 2019 12:33
Last Modified : 23 Sep 2019 12:33
URI: http://epubs.surrey.ac.uk/id/eprint/852693

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