Cloud computing has made the software development process fast and flexible but on the other hand it has contributed to increasing security attacks. Employees who manage the data in cloud companies may face insider attack, affecting their reputation. They have the advantage of accessing the user data by interacting with the authentication mechanism. The primary aim of this research paper is to provide a novel secure authentication mechanism by using Blockchain technology for cloud databases. Blockchain makes it difficult to change user login credentials details in the user authentication process by an insider. The insider is not able to access the user authentication data due to the distributed ledger-based authentication scheme. Activity of insider can be traced and cannot be changed. Both insider and outsider user’s are authenticated using individual IDs and signatures. Furthermore, the user access control on the cloud database is also authenticated. The algorithm and theorem of the proposed mechanism have been given to demonstrate the applicability and correctness.The proposed mechanism is tested on the Scyther formal system tool against denial of service, impersonation, offline guessing, and no replay attacks. Scyther results show that the proposed methodology is secure cum robust.

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In recent times, cloud computing has influenced every sector of life, from managing user database online on the cloud to access it on the cloud makes it more flexible to use. Cloud computing has its own security issues like privacy, integrity, confidentiality and authentication. In order to access data on the cloud Authentication majorly plays a very important role. This paper presents a secure multifactor authentication that can be used for Hospital Inventory access in Virtual Private Cloud. Virtual Private cloud is having the benefit of localization as all the data of cloud are accessible within the organization. To secure Hospital Inventory access in Virtual Private Cloud this paper proposes multifactor authentication technique using Biometric, MAC address via payload .The proposed a multifactor authentication protocol which is also validated by using a validation tool Scyther. The outcomes indicate that the proposed multifactor authentication is a robust technique.

Computing on the cloud has changed the working of mankind in every manner, from storing to fetching every information on the cloud. To protect data on the cloud various access procedures and policies are used such as authentication and authorization. Authentication means the intended user is access data on the cloud and authorization means the user is accessing only that data for which he is allowed. The intended user now also includes Cyber-Physical Devices. Cyber-Physical Devices share data between them, fetch data from cloud. Cloud data is managed by employees of cloud Companies. Persons sitting on the cloud managing companies data is always doubtful as so many insider attacks have happened in the past affecting the company Image in the market. Data Related to Cyber-Physical Space may come under Insider attack. Companies managing user data are also liable to protect user data from any type of attack under various sections of the Indian IT act. Work in this paper has proposed blockchain as a possible solution to track the activities of employees managing cloud. Employee authentication and authorization are managed through the blockchain server. User authentication related data is stored in blockchain. Authorization rules are written in any Role/Attribute-based access language. These authorization rules stores the data related to user requests allowed access to data in blockchain. Proposed work will help cloud companies to have better control over their employee’s activities, thus help in preventing insider attack on User and Cyber-Physical Devices.

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