Outsourced Data In Cloud Computing Research Articles

Aggregated symmetric key-based hierarchical group data sharing in cloud

Cloud computing is defined as a type of computing that relies on sharing computing resources rather than having local servers or personal devices to handle applications. Data sharing is the major advantage in cloud computing, hence cloud computing security is a major concern. Cloud computing security refers to the set of procedures, processes and standards designed to provide information security assurance in a cloud computing environment. A key challenge to designing such encryption scheme lies in the efficient management of encryption keys to be used for the documents. In order to examine the flexibility, scalability and fine grained access scheme of outsourced data in cloud computing, this paper introduces a new scheme called HASK scheme by extending the file sharing capabilities of KASE with a hierarchical taxonomy. In HASK, we propose an algorithm called HASK encryption as the enhanced scheme for KASE.

A Light Weight Cryptographic Technique for Secure Outsourcing and Retrieval of Data in Cloud Computing

Outsourcing large volumes of data to public cloud has the potential benefits to consumers. It also brings security issues as the cloud is treated as untrusted from the user point of view. Security issues may arise due to many reasons such as virtualization, resource pooling, elasticity, hidden hardware problems besides internal and external attacks launched by adversaries. Service Level Agreements (SLAs) between Cloud Service Provider (CSP) and cloud consumer are to be honoured for better social welfare. Therefore, it is indispensable to have mechanisms to ensure security to outsourced data when it is at rest and when it is in transit as well. Towards this end, many solutions came as found in the literature. However, most of the cryptographic methods employed were expensive. It is still an open challenge to develop light weight cryptographic methods for secure storage and retrieval or search for outsourced encrypted data. In this paper we proposed a methodology for light weight encryption which proved to be effective and suitable for cloud computing environments. An algorithm named Hybrid Lightweight Data Encryption (HLDE) is proposed and implemented. Empirical study is made on the same to validate our approach. The experimental results revealed that the proposed method is better than the state of the art in terms of high performance and strong security to outsourced data in cloud computing.

An Attribute-Based Assured Deletion Scheme in Cloud Computing

With the rapid development of cloud computing, it has been increasingly attractive for individuals and groups to store and share data via cloud storage. Once stored in the third-party cloud storage service providers, the privacy and integrity of outsourced data should be attached with more attention as a challenging task. This article presents the attribute-based assured deletion scheme (AADS) which aims to protect and assuredly delete outsourced data in cloud computing. It encrypts outsourced data files with standard cryptographic techniques to guarantee the privacy and integrity, and assuredly deletes data upon revocations of attributes. AADS could be applied to solve important security problems by supporting fine-grained attribute-based policies and their combinations. According to the comparison and analysis, AADS provides efficient data encryption and flexible attribute-based assured deletion for cloud-stored data with an acceptable concession in performance cost.

Evolving Cryptographic Approach for Enhancing Security of Resource Constrained Mobile Device Outsourced Data in Cloud Computing

Mobile cloud computing in the increasing popularity among users of mobile device enables to store their data in cloud. Security is the major concern when the sensitive information is stored and transferred across the internet. It is essential to make sure that the data is secured and protected. In this paper, we discussed the problem of privacy of data with reducing the resources usage. Moreover, mobile cloud computing has limitations in resources such as power energy, processor, Memory and storage. Cryptography ensures the confidentiality, authentication, availability, and integrity of the data. This is done through cryptographic algorithms such as Data Encryption Standard (DES), Blowfish and Advanced Encryption Standard (AES). The experimental results evaluated and compared the performance of the encryption algorithms. The performance metrics used are encryption and decryption time, CPU and Memory utilization. Evaluation results showed a significant improvement in reducing the resources, amongst all the techniques, choosing a suitable encryption algorithm based on different parameters that are best fit to the future user requirements is considered.

Improvement of Privacy and Security in Hybrid Cloud with Attribute Group Based Access Control

Cloud computing enables users to accumulate their sensitive data into cloud service providers to achieve scalable services on-demand. Outstanding security requirements arising from this means of data storage and management include data security and privacy. Attribute-based Encryption (ABE) is an efficient encryption system with fine-grained access control for encrypting out-sourced data in cloud computing. Since data outsourcing systems require flexible access control approach Problems arises when sharing confidential corporate data in cloud computing. User-Identity needs to be managed globally and access policies can be defined by several authorities. Data is dual encrypted for more security and to maintain De-Centralization in Multi-Authority environment.

Attribute-Based Access Control with Constant-Size Ciphertext in Cloud Computing

With the popularity of cloud computing, there have been increasing concerns about its security and privacy. Since the cloud computing environment is distributed and untrusted, data owners have to encrypt outsourced data to enforce confidentiality. Therefore, how to achieve practicable access control of encrypted data in an untrusted environment is an urgent issue that needs to be solved. Attribute-based encryption (ABE) is a promising scheme suitable for access control in cloud storage systems. This paper proposes a hierarchical attribute-based access control scheme with constant-size ciphertext. The scheme is efficient because the length of ciphertext and the number of bilinear pairing evaluations to a constant are fixed. Its computation cost in encryption and decryption algorithms is low. Moreover, the hierarchical authorization structure of our scheme reduces the burden and risk of a single authority scenario. We prove the scheme is of CCA2 security under the decisional q-Bilinear Diffie-Hellman Exponent assumption. In addition, we implement our scheme and analyse its performance. The analysis results show the proposed scheme is efficient, scalable, and fine-grained in dealing with access control for outsourced data in cloud computing.

Identity-based proxy re-encryption version 2: Making mobile access easy in cloud

Proxy re-encryption (PRE) enables an authorized proxy to convert a ciphertext under Alice’s public key into a ciphertext under Bob’s public key without exposing the encrypted message. In existing PRE systems, the original ciphertexts and the re-encrypted ones are both required to be in the same cryptosystem, which limits their applications in cloud computing systems. In this paper, we propose a new proxy re-encryption pattern, referred to as an identity-based proxy re-encryption version 2 (IBPRE2). It allows an authorized proxy to convert a ciphertext of an identity-based broadcast encryption (IBBE) scheme into a ciphertext of an identity-based encryption (IBE) scheme. With IBPRE2, one can take advantage of IBBE to securely share data with a set of recipients, and then incorporate an additional one into the authorized set through the re-encryption mechanism, without decrypting the IBBE ciphertext nor leaking any sensitive information. We formalize the security requirements in IBPRE2 and propose a provably CCA-secure scheme. The unique feature of ciphertext transformation from a complicated cryptosystem to a simple one makes our IBPRE2 a versatile cryptographic tool to secure outsourced data in cloud computing.

Multi Key Word Search and Trusted Auditing System to Verify the Integrity of Outsourced Data in Cloud Computing

Cloud computing provide the owner to store their data into the cloud servers and data consumers can access the data from cloud by on demand. By outsourcing the data, the owners can no need to maintain the data locally. Due to this, the owner requires the auditing service to verify the correctness of the data stored in the cloud servers. To reduce the communication cost the server should return only the relevance files while the user request for the data files. Sharing relevance data and checking the integrity of the outsourced data is still a challenging issue. Ranked search greatly enhances system usability by returning the matching files in a ranked order regarding to certain relevance criteria .Our proposed system is developed based on the fragment structure , hash index hierarchy and top n query algorithm to retrieve the n number of best matched results for the given query. In addition we provide a load balancing scheme to process the jobs submitted to the server. Our experimental results prove that the proposed system is highly efficient and secured.

HASBE: A Hierarchical Attribute-Based Solution for Flexible and Scalable Access Control in Cloud Computing

Cloud computing has emerged as one of the most influential paradigms in the IT industry in recent years. Since this new computing technology requires users to entrust their valuable data to cloud providers, there have been increasing security and privacy concerns on outsourced data. Several schemes employing attribute-based encryption (ABE) have been proposed for access control of outsourced data in cloud computing; however, most of them suffer from inflexibility in implementing complex access control policies. In order to realize scalable, flexible, and fine-grained access control of outsourced data in cloud computing, in this paper, we propose hierarchical attribute-set-based encryption (HASBE) by extending ciphertext-policy attribute-set-based encryption (ASBE) with a hierarchical structure of users. The proposed scheme not only achieves scalability due to its hierarchical structure, but also inherits flexibility and fine-grained access control in supporting compound attributes of ASBE. In addition, HASBE employs multiple value assignments for access expiration time to deal with user revocation more efficiently than existing schemes. We formally prove the security of HASBE based on security of the ciphertext-policy attribute-based encryption (CP-ABE) scheme by Bethencourt <etal xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"/> and analyze its performance and computational complexity. We implement our scheme and show that it is both efficient and flexible in dealing with access control for outsourced data in cloud computing with comprehensive experiments.