The idea of sharing economy gives rise to unique ideas and develops innovative businesses. This article aims to relate the smart city concept by introducing the smart transport system and explores the opportunities of adopting blockchain technology in ride-sharing services. Blockchain technology is a distributed, decentralized public ledger that allows peer-to-peer transactions in a secured way without any third party. This paper proposes a blockchain-based framework from the existing centralized framework for a ride-sharing service and implements the same as a decentralized application (DApp) based on smart contracts on Ethereum Blockchain. Using smart contracts facilitate the users with automated transactions, removes the intermediaries, and enables various activities to be carried out safely and securely. Implementation of smart contracts is done using the Solidity programming language. This DApp uses the min matching algorithm to match riders requesting rideshare to save total travel distance. With the overwhelming growth in the usage of cryptocurrencies, smart contracts usage in applications as proposed in this paper can transform the sharing economy.

The Cloud computing services and security issues are growing exponentially with time. All the CSPs provide utmost security but the issues still exist. Number of technologies and methods are emerged and futile day by day. In order to overcome this situation, we have also proposed a data storage security system using a binary tree approach. Entire services of the binary tree are provided by a Trusted Third Party (TTP) .TTP is a government or reputed organization which facilitates to protect user data from unauthorized access and disclosure. The security services are designed and implemented by the TTP and are executed at the user side. Data classification, Data Encryption and Data Storage are the three vital stages of the security services. An automated file classifier classify unorganized files into four different categories such as Sensitive, Private, Protected and Public. Applied cryptographic techniques are used for data encryption. File splitting and multiple cloud storage techniques are used for data outsourcing which reduces security risks considerably. This technique offers file protection even when the CSPs compromise.

Storage as a service will diminish the risk of data storage but it leads to the era of data storage security. Studies show that multi cloud or inter cloud or clouds of cloud storage are eminent techniques which reduce the traditional risk of storage cloud. Replicating all data into numerous clouds will lead to monetary detriment as well as gigantic growth of electronic data. Inorder to overcome this horrible situation we have proposed a clouds tree to store fi les into multiple locations. Clouds tree is a hierarchical arrangement of public CSPs. There is no interconnection or confi guration between CSPs but the relation is depends on fi le storage. The fi les which are more sensitive and capable to achieve business continuity are needed to store multiple locations. File splitting, encryption and storing different CSPs are the technique behind this work. Double or triple authentication schemes are provided to access sensitive or private data.

Abstract:The most important challenge faced by a public cloud is hacking or data intrusion. If an attacker hack the cloud they can manipulate the information or disable the services. We all know that a Biometric system can ensure that rendered services can only accessed by a registered user only. It can identify an authorized user by checking the physiological features of that person. Here I wish to propose a new approach based on biometric encryption for to improve the security of data sharing in public cloud. In this approach we combine the digital key with the biometric image to create bioscrypt. These digital keys can be used as the cryptographic key. During the verification the biometric image is combining with bioscrypt to retrieve the key for the encryption and decryption of the data. The cipher text is then uploading to the public cloud. And an authorized user can retrieve data by his digital key. This approach ensures the data integrity and confidentiality.