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| References | Overviews | Advantages | Techniques | Years |
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| [29] | To tackle the problems of computation efficiency and weak data security, ABDS scheme is proposed in cloud computing; the users are enabled in this approach to check the cost of the ciphertext in online/offline encryption mode before going to expensive full decryption | The users can get online and offline encryption with minimum cost and time; the proposed work gives strong security to weak data | The ABE, attribute-based data sharing (ABDS), chameleon hash function, and online/offline ciphertexts | 2018 |
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| [30] | The framework used two types of CSPs to secure the cloud data while sharing the data and passes through several stages; the main focus is to provide security to the big data system | The model highly provides security to cloud data services such as storage, networking, data management, access control, and infrastructure security | Bonitasoft, business process management, CSP-1, and CSP-2 | 2016 |
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| [31] | To tackle the NP-hard problem, a series of MHAs, characteristics with a simple structure, fast confluent, and energy have been proposed; the MOO problem solved in terms of reliability, make span, and time | The proposed CAS solved the problems of the salesman, economic dispatch, and fuzzy system identification; the ACO finds the optimal path in a graph investigating the behavior of an ant colony, make span and flow time analyze the reliability factor | The ACO, chaos factor, make span, time flow, and GA-CAS | 2016 |
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| [32] | The proposed work highly secures the cloud data; in this work, the data is split and then distributed by different cloud servers; the paper tries to resolve the abuse issue; the direct access of the cloud to the user’s original data is prevented | The experiment proves the proposed work efficiently performs this task by consuming less time as compared to AES | The algorithms SED2 and EDcon | 2016 |
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| [33] | The US government data is protected from advanced persistent threats (APTs); the cloud security assessment model is used for four multitenant IaaS cloud architecture | The CCS penetration probability is high if minimum security control sets are applied | The cloud security assessment model, APTs, and virtual machine | 2017 |
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