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The Scientific World Journal
Volume 2014 (2014), Article ID 615679, 10 pages
Research Article

A Study of Practical Proxy Reencryption with a Keyword Search Scheme considering Cloud Storage Structure

Department of Computer Software Engineering, Soonchunhyang University, Asan-si, Chungcheongnam-do, Republic of Korea

Received 31 August 2013; Accepted 22 October 2013; Published 12 February 2014

Academic Editors: H. Cheng and H.-E. Tseng

Copyright © 2014 Sun-Ho Lee and Im-Yeong Lee. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Data outsourcing services have emerged with the increasing use of digital information. They can be used to store data from various devices via networks that are easy to access. Unlike existing removable storage systems, storage outsourcing is available to many users because it has no storage limit and does not require a local storage medium. However, the reliability of storage outsourcing has become an important topic because many users employ it to store large volumes of data. To protect against unethical administrators and attackers, a variety of cryptography systems are used, such as searchable encryption and proxy reencryption. However, existing searchable encryption technology is inconvenient for use in storage outsourcing environments where users upload their data to be shared with others as necessary. In addition, some existing schemes are vulnerable to collusion attacks and have computing cost inefficiencies. In this paper, we analyze existing proxy re-encryption with keyword search.