scholarly journals A Traceable and Revocable Multiauthority Attribute-Based Encryption Scheme with Fast Access

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Kai Zhang ◽  
Yanping Li ◽  
Yun Song ◽  
Laifeng Lu ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Cloud Storage ◽  
Data Access ◽  
Efficiency Analysis ◽  
Encryption Scheme ◽  
Constant Number ◽  
Promising Technique ◽  
Diffie Hellman ◽  
Attribute Based Encryption ◽  
Ciphertext Policy ◽  
Fast Access

Multiauthority ciphertext-policy attribute-based encryption (MA-CP-ABE) is a promising technique for secure data sharing in cloud storage. As multiple users with same attributes have same decryption privilege in MA-CP-ABE, the identity of the decryption key owner cannot be accurately traced by the exposed decryption key. This will lead to the key abuse problem, for example, the malicious users may sell their decryption keys to others. In this paper, we first present a traceable MA-CP-ABE scheme supporting fast access and malicious users’ accountability. Then, we prove that the proposed scheme is adaptively secure under the symmetric external Diffie–Hellman assumption and fully traceable under the q -Strong Diffie–Hellman assumption. Finally, we design a traceable and revocable MA-CP-ABE system for secure and efficient cloud storage from the proposed scheme. When a malicious user leaks his decryption key, our proposed system can not only confirm his identity but also revoke his decryption privilege. Extensive efficiency analysis results indicate that our system requires only constant number of pairing operations for ciphertext data access.

scholarly journals Modified Ciphertext-Policy Attribute-Based Encryption Scheme with Efficient Revocation for PHR System

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Hongying Zheng ◽  
Jieming Wu ◽  
Bo Wang ◽  
Jianyong Chen
Keyword(s):  
Cloud Storage ◽  
Personal Health Record ◽  
Storage System ◽  
Personal Health ◽  
Encryption Scheme ◽  
Promising Technique ◽  
Access Policy ◽  
Attribute Based Encryption ◽  
Role Based ◽  
Ciphertext Policy

Attribute-based encryption (ABE) is considered a promising technique for cloud storage where multiple accessors may read the same file. For storage system with specific personal health record (PHR), we propose a modified ciphertext-policy attribute-based encryption scheme with expressive and flexible access policy for public domains. Our scheme supports multiauthority scenario, in which the authorities work independently without an authentication center. For attribute revocation, it can generate different update parameters for different accessors to effectively resist both accessor collusion and authority collusion. Moreover, a blacklist mechanism is designed to resist role-based collusion. Simulations show that the proposed scheme can achieve better performance with less storage occupation, computation assumption, and revocation cost compared with other schemes.

scholarly journals Towards Virtuous Cloud Data Storage Using Access Policy Hiding in Ciphertext Policy Attribute-Based Encryption

2021 ◽  
Vol 13 (11) ◽  
pp. 279
Author(s):  
Siti Dhalila Mohd Satar ◽  
Masnida Hussin ◽  
Zurina Mohd Hanapi ◽  
Mohamad Afendee Mohamed
Keyword(s):  
Data Storage ◽  
Cloud Storage ◽  
Security Analysis ◽  
Data Access ◽  
Logical Connective ◽  
Encrypted Data ◽  
Cloud Data ◽  
Access Policy ◽  
Attribute Based Encryption ◽  
Ciphertext Policy

Managing and controlling access to the tremendous data in Cloud storage is very challenging. Due to various entities engaged in the Cloud environment, there is a high possibility of data tampering. Cloud encryption is being employed to control data access while securing Cloud data. The encrypted data are sent to Cloud storage with an access policy defined by the data owner. Only authorized users can decrypt the encrypted data. However, the access policy of the encrypted data is in readable form, which results in privacy leakage. To address this issue, we proposed a reinforcement hiding in access policy over Cloud storage by enhancing the Ciphertext Policy Attribute-based Encryption (CP-ABE) algorithm. Besides the encryption process, the reinforced CP-ABE used logical connective operations to hide the attribute value of data in the access policy. These attributes were converted into scrambled data along with a ciphertext form that provides a better unreadability feature. It means that a two-level concealed tactic is employed to secure data from any unauthorized access during a data transaction. Experimental results revealed that our reinforced CP-ABE had a low computational overhead and consumed low storage costs. Furthermore, a case study on security analysis shows that our approach is secure against a passive attack such as traffic analysis.

scholarly journals Access Policy’s Over Encrypted Cloud Storage for Secure Deduplication

2018 ◽  
Vol 7 (3.27) ◽  
pp. 27
Author(s):  
G Kiran Kumar ◽  
E Amarnath Reddy ◽  
B Mamatha ◽  
Kompally Manisha
Keyword(s):  
Cloud Storage ◽  
Data Access ◽  
Public Key Cryptography ◽  
Public Key ◽  
Symmetric Encryption ◽  
Private Key ◽  
Attribute Based Encryption ◽  
Original File ◽  
Ciphertext Policy ◽  
Access Policies

Attribute-Based Encryption (ABE) is a basic concept that considers public-key cryptography. Ciphertext-Policy ABE (CP-ABE) is one of the approaches used by ABE for data sharing in the cloud. In CP-ABE scheme, each user’s private key has a set of attributes and then the user decrypts a ciphertext if it holds a matching key. Our proposed system provides an extension to CP-ABE by implementing AES. AES uses a symmetric encryption key algorithm for a same set of keys. Our system provides a higher security through AES because of its complexity and helps in generating the content key . This key is used during the encryption of the original file over the cloud. Our methodology also focuses on deduplication to provide less consumption of cloud storage over the cloud. Another advantage of using this system is to provide an efficient way of data access via access policies for a certain set of credentials.  

scholarly journals Research on Ciphertext-Policy Attribute-Based Encryption with Attribute Level User Revocation in Cloud Storage

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Guangbo Wang ◽  
Jianhua Wang
Keyword(s):  
Access Control ◽  
Cloud Storage ◽  
Control Policy ◽  
Attribute Level ◽  
Fine Grained ◽  
Computational Load ◽  
Diffie Hellman ◽  
Attribute Based Encryption ◽  
Important Challenge ◽  
Ciphertext Policy

Attribute-based encryption (ABE) scheme is more and more widely used in the cloud storage, which can achieve fine-grained access control. However, it is an important challenge to solve dynamic user and attribute revocation in the original scheme. In order to solve this problem, this paper proposes a ciphertext-policy ABE (CP-ABE) scheme which can achieve attribute level user attribution. In this scheme, if some attribute is revoked, then the ciphertext corresponding to this attribute will be updated so that only the individuals whose attributes meet the access control policy and have not been revoked will be able to carry out the key updating and decrypt the ciphertext successfully. This scheme is proved selective-structure secure based on the q-Parallel Bilinear Diffie-Hellman Exponent (BDHE) assumption in the standard model. Finally, the performance analysis and experimental verification have been carried out in this paper, and the experimental results show that, compared with the existing revocation schemes, although our scheme increases the computational load of storage service provider (CSP) in order to achieve the attribute revocation, it does not need the participation of attribute authority (AA), which reduces the computational load of AA. Moreover, the user does not need any additional parameters to achieve the attribute revocation except for the private key, thus saving the storage space greatly.

scholarly journals Updatable Ciphertext-Policy Attribute-Based Encryption Scheme With Traceability and Revocability

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 66832-66844 ◽  
Author(s):  
Zhenhua Liu ◽  
Jing Xu ◽  
Yan Liu ◽  
Baocang Wang
Keyword(s):  
Encryption Scheme ◽  
Attribute Based Encryption ◽  
Ciphertext Policy
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