Abstract
Attribute-Based Encryption (ABE) is a relatively new encryption technology which is
similar to multi-receiver encryption but the privacy of ciphertext receivers is protected
by a set of attributes such that no one, even the encryptor, knows the identities of the
receivers. Although the identities of those receivers remain unknown, the encryptor can
ensure that all of the receivers cannot decrypt the ciphertext except for those who
match the restrictions on predefined attribute values associated with the ciphertext.
However, maintaining the correctness of users¡¦ attributes will take huge cost because
the interactions between all users and the key generation center (KGC) are required to
renew all of their private keys whenever a user joins, leaves the group, or updates the
value of any of his attributes. Since user joining, leaving, and attribute updating may
occur frequently in real situations, membership management will become a quite
important issue in an ABE system but no existing scheme can perfectly cope with this
problem. In this manuscript, we will present an ABE scheme which aims at the issue on
dynamic membership management. Our work keeps high flexibility of the constrains on
attributes and makes it possible for the procedures of user joining, leaving, and attribute
updating to be dynamic, that is, it is not necessary for those users who do not update
their attribute statuses to renew their private keys when some user changes his status.
Finally, we also formally prove the security of the proposed scheme.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0820108-161748 |
| Date | 20 August 2008 |
| Creators | Ruan, He-Ming |
| Contributors | Chun-Hung Lin, Chun-I Fan, Chih-Hung Wang, Wen-Sheng Juang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0820108-161748 |
| Rights | not_available, Copyright information available at source archive |
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