Cryptology ePrint Archive: Report 2009/081

Ensuring Data Storage Security in Cloud Computing

Cong Wang and Qian Wang and Kui Ren and Wenjing Lou

Abstract: Cloud Computing has been envisioned as the next-generation architecture of IT Enterprise. In contrast to traditional solutions, where the IT services are under proper physical, logical and personnel controls, Cloud Computing moves the application software and databases to the large data centers, where the management of the data and services may not be fully trustworthy. This unique attribute, however, poses many new security challenges which have not been well understood. In this article, we focus on cloud data storage security, which has always been an important aspect of quality of service. To ensure the correctness of users' data in the cloud, we propose an effective and flexible distributed scheme with two salient features, opposing to its predecessors. By utilizing the homomorphic token with distributed verification of erasure-coded data, our scheme achieves the integration of storage correctness insurance and data error localization, i.e., the identification of misbehaving server(s). Unlike most prior works, the new scheme further supports secure and efficient dynamic operations on data blocks, including: data update, delete and append. Extensive security and performance analysis shows that the proposed scheme is highly efficient and resilient against Byzantine failure, malicious data modification attack, and even server colluding attacks.

Category / Keywords: cryptographic protocols /

Date: received 16 Feb 2009, last revised 26 Apr 2009

Contact author: kren at ece iit edu

Available format(s): PDF | BibTeX Citation

Version: 20090427:044412 (All versions of this report)

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