scholarly journals A Secure and Computable Blockchain-Based Data Sharing Scheme in IoT System

Information ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 47
Author(s):  
Shuang Sun ◽  
Rong Du ◽  
Shudong Chen
Keyword(s):  
Data Sharing ◽  
Traffic Management ◽  
Large Scale ◽  
Homomorphic Encryption ◽  
Security Analysis ◽  
Data Access ◽  
Computing Services ◽  
Data Access Control ◽  
Correctness Checking ◽  
Ciphertext Policy

The internet of things (IoT) devices are expected to collect vast amounts of data that support different kinds of applications such as health monitor, smart home, and traffic management. However, its characteristics such as resource-constrained nature, dynamicity, and large-scale growth bring challenges to secure IoT data sharing. Nowadays, blockchain-based ciphertext-policy attribute-based encryption (CP-ABE) was proposed to realize secure IoT data sharing. In blockchain-based CP-ABE data sharing schemes, the data are encrypted and stored in the cloud. Once users want to process the data, they should download and then decrypt the ciphertext in the client-end, and after processing the data, users encrypt and upload the ciphertext onto the cloud. This outweighs the advantage of using cloud computing resources. Fully homomorphic encryption (FHE) and homomorphic signature technology may be adopted to realize ciphertext computation and for correctness checking of ciphertext computation results. In this paper, we propose a secure and computable IoT data sharing system to ensure users enjoying the computation convenience of the cloud-end. Specifically, the proposed system integrates CP-ABE and FHE to realize secure IoT data sharing and ciphertext computation. In addition, we generated homomorphic signatures of ciphertexts to enable users to check the correctness of the ciphertext computation results. Moreover, to supervise the cloud, providing the honest IoT data access control, storage, and computing services for users, we recorded the access policy of the data, the hash of the data, the signature of the ciphertext, and the homomorphic signature of the ciphertext on the blockchain. The performance evaluation and security analysis show the proposed scheme is practical and secure.

scholarly journals Secure Data Access Control with Cipher Text Update and Computation Outsourcing in Fog Computing for Internet of Things

2021 ◽  
Vol 12 (2) ◽  
pp. 1592-1597
Author(s):  
Shaik Jaffer Vali , Et. al.
Keyword(s):  
Access Control ◽  
Fog Computing ◽  
Information Access ◽  
Security Analysis ◽  
Data Access ◽  
The Novel ◽  
Fine Grained ◽  
Cipher Text ◽  
Data Access Control ◽  
Ciphertext Policy

Fog Computing is a region of Computer Science that is under steady construction and development, and related to data security, the worldview turns out to be more solid and secure for IoT's edge stages. The verification of limited memory devices has serious issues since memory utilization is high when applied with different models that have the motivation behind shared confirmation. In this paper, we propose the Novel cipher text-based encryption model (NCEM) which has an information access control plot dependent on Ciphertext-Policy it give information privacy, fine-grained control, and mysterious validation in a multi-authority fog computing framework. The sign cryption and plan cryption overhead for the client is altogether diminished by redistributing the bothersome calculation tasks to fog hubs. The proposed conspire is demonstrated to be secure in the standard model and can give trait repudiation and public unquestionable status. The security analysis, asymptotic multifaceted nature examination, and implementation results demonstrate that our construction can offset the security objectives with useful effectiveness in calculation.

scholarly journals Efficient Hierarchical and Time-Sensitive Data Sharing with User Revocation in Mobile Crowdsensing

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Jiawei Zhang ◽  
Jianfeng Ma ◽  
Teng Li ◽  
Qi Jiang
Keyword(s):  
Data Sharing ◽  
High Efficiency ◽  
Data Access ◽  
Sensitive Data ◽  
Mobile Crowdsensing ◽  
Data Access Control ◽  
Sharing Scheme ◽  
User Revocation ◽  
And Performance ◽  
Ciphertext Policy

Recently, cloud-based mobile crowdsensing (MCS) has developed into a promising paradigm which can provide convenient data sensing, collection, storage, and sharing services for resource-constrained terminates. Nevertheless, it also inflicts many security concerns such as illegal access toward user secret and privacy. To protect shared data against unauthorized accesses, many studies on Ciphertext-Policy Attribute-Based Encryption (CP-ABE) have been proposed to achieve data sharing granularity. However, providing a scalable and time-sensitive data-sharing scheme across hierarchical users with compound attribute sets and revocability remains a big issue. In this paper, we investigate this challenge and propose a hierarchical and time-sensitive CP-ABE scheme, named HTR-DAC, which is characteristics of time-sensitive data access control with scalability, revocability, and high efficiency. Particularly, we propose a time-sensitive CP-ABE for hierarchical structured users with recursive attribute sets. Moreover, we design a robust revocable mechanism to achieve direct user revocation in our scheme. We also integrate verifiable outsourced decryption to improve efficiency and guarantee correctness in decryption procedure. Extensive security and performance analysis is presented to demonstrate the security requirement satisfaction and high efficiency for our data-sharing scheme in MCS.

scholarly journals Enabling efficient traceable and revocable time-based data sharing in smart city

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
Jiawei Zhang ◽  
Teng Li ◽  
Qi Jiang ◽  
Jianfeng Ma
Keyword(s):  
Access Control ◽  
Data Sharing ◽  
Smart City ◽  
Large Scale ◽  
Fog Computing ◽  
Data Access ◽  
Sensitive Information ◽  
Fine Grained ◽  
Data Access Control ◽  
Security Proof

AbstractWith the assistance of emerging techniques, such as cloud computing, fog computing and Internet of Things (IoT), smart city is developing rapidly into a novel and well-accepted service pattern these days. The trend also facilitates numerous relevant applications, e.g., smart health care, smart office, smart campus, etc., and drives the urgent demand for data sharing. However, this brings many concerns on data security as there is more private and sensitive information contained in the data of smart city applications. It may incur disastrous consequences if the shared data are illegally accessed, which necessitates an efficient data access control scheme for data sharing in smart city applications with resource-poor user terminals. To this end, we proposes an efficient traceable and revocable time-based CP-ABE (TR-TABE) scheme which can achieve time-based and fine-grained data access control over large attribute universe for data sharing in large-scale smart city applications. To trace and punish the malicious users that intentionally leak their keys to pursue illicit profits, we design an efficient user tracing and revocation mechanism with forward and backward security. For efficiency improvement, we integrate outsourced decryption and verify the correctness of its result. The proposed scheme is proved secure with formal security proof and is demonstrated to be practical for data sharing in smart city applications with extensive performance evaluation.

scholarly journals A Collusion-Resistant Blockchain-Enabled Data Sharing Scheme with Decryption Outsourcing under Time Restriction

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Xieyang Shen ◽  
Chuanhe Huang ◽  
Xiajiong Shen ◽  
Jiaoli Shi ◽  
Danxin Wang
Keyword(s):  
Access Control ◽  
Data Sharing ◽  
Time Slot ◽  
Security Analysis ◽  
Collusion Resistance ◽  
Time Restrictions ◽  
Control Scheme ◽  
And Performance ◽  
Ciphertext Policy ◽  
Time Restriction

With the ever-increasing demands on decentralization and transparency of cloud storage, CP-ABE (Ciphertext Policy-Attribute-Based Encryption) has become a promising technology for blockchain-enabled data sharing methods due to its flexibility. However, real-world blockchain applications usually have some special requirements like time restrictions or power limitations. Thus, decryption outsourcing is widely used in data sharing scenarios and also causes concerns about data security. In this paper, we proposed a secure access control scheme based on CP-ABE, which could share contents during a particular time slot in blockchain-enabled data sharing systems. Specifically, we bind the time period with both ciphertexts and the keys to archive the goal of only users who have the required attributes in a particular time slot can decrypt the content. Besides, we use time slots as a token to protect the data and access control scheme when users want to outsource the decryption phase. The security analysis shows that our scheme can provide collusion resistance ability under a time restriction, and performance evaluations indicate that our scheme uses less time in decryption compared to other schemes while ensuring security.

scholarly journals Data Secure Algorithm in Cloud Storage

2020 ◽  
Vol 9 (3) ◽  
pp. 2632-2635
Keyword(s):  
Cloud Storage ◽  
Control Measure ◽  
Security Analysis ◽  
Data Access ◽  
Bilinear Pairing ◽  
Cloud Environment ◽  
Security Issues ◽  
Data Access Control ◽  
Cloud Server ◽  
System States

The challenging task is protecting the data which are uploaded to the cloud becomes bigger worries in a cloud environment system. In this type of security is needed for monitoring of data access in a cloud environment and is getting more and more attention in recent days. Few strategies which can be afford for top-secret and an unknown authentication for delicate information and it is more efficient than doing the encrypting data first and then sign or doing the sign first then encrypting the data. However, in so many previous work, delicate information of data users can be reveal to authority, and only the authority is responsible to answer to that type of attribute management and generation of key in the system. The proposed system states that confidentiality and protective of data access control over the cipher text scheme based on cloud security. It is provide a control measure, attribute confidentiality and guard the data’s of user concurrently in a multiple authority cloud system. Both the attributes of designcryptor and signcryptor can be kept secret by not knowing to the authorities and cloud storage server. Besides, decryption in the clouds for users as becomes meaningfully reduced by outsourcing the unwanted bilinear pairing process to the cloud server without humiliating the attribute privacy. The planned scheme is confirmed for protecting the standard model and has the skill to provide top secret, unforged, unknown authentication, and verifiability of public. The security analysis which are relating to comparison of difficulty and results of execution will indicate that the proposed system has the capacity to balance the security issues with respect to computation in hypothetical efficiency.

Secure Data Sharing: Blockchain enabled Data Access Control Framework for IoT

2021 ◽  
pp. 1-1
Author(s):  
Xin Wei ◽  
Yong Yan ◽  
Shaoyong Guo ◽  
Xuesong Qiu ◽  
Feng Qi
Keyword(s):  
Access Control ◽  
Data Sharing ◽  
Data Access ◽  
Data Access Control ◽  
Control Framework ◽  
Secure Data
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