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The rapid adaptation to mobile devices and data sharing has changed our life style significantly. Despite the fact that this provides great comfort and proficiency, it also imposes greater challenges in ensuring a secure transfer of sensitive information through these devices. This information could be highly confidential that the owner wants to provide access privileges only to authorized individuals. Many cryptographic algorithms together with potent data protection mechanisms available today are robust enough to ensure the Confidentiality, Integrity and Availability of information. One significant use-case in this regard is when the data owner wants to only share the data securely with the authorized user just once, and making it extremely difficult for user to store or make a copy of the data or to share it with others. In this scenario, it is practically impossible for the data owner to be available and spy on the user all the time to ensure these security requirements are met. In order to address this concern, this thesis work tried to provide a secure mechanism to share information that would authorize end users to access data only once and endeavors to prevent the user from duplicating the data and sharing it with unauthorized users. A part of this work proposes a variant of Proxy Re-encryption algorithm, a relatively new cryptographic primitive, which offers the data owner a way to securely share his/her data via a proxy server, without the need to be available all the time. The proxy server takes care of data re-encryption and data distribution to the registered users, without letting any unauthorized user to decrypt the information and also the proxy itself cannot decrypt the information. With this scheme, the proxy encrypts an already encrypted information in such a way that another secret key can decrypt it. The reencryption key is unique for each registered user and is generated by the data owner by combining the registered user’s public key and his/her own private key. Here, the novelty of this thesis and

Secure data sharing by restricting user to one-time access