• M.A. BIBI AYSHA
• Md.ASIM

In recent years one of the most important technique emerged in IT industry is cloud computing. This technology requires the data stored in cloud to be trusted, concept of security and privacy has increased. Most of the schemes proposed so far doesn’t have flexibility in implementing complex access control. This paper achieves the flexibility and fine-grained access control in public cloud. We know that data security is an important factor in cloud which is to be concentrated because of data outsourcing and lack of trust in cloud servers. Another important pattern in cloud computing is the storage which acts as a service which provides great flexibility and also economic savings. The most important technique for data sharing in cloud is achieved by encrypting the data and issuing decryption keys by the data owners to the authorized users. One of the best technique used here is the CP-ABE (Ciphertext Policy Attribute Based Encryption) in which both keys and attributes are managed by a trusted authority. To protect the confidentiality of the data from the CSP (Cloud Service Provider) many schemes have been invented. However, there is no efficient scheme, which embeds fine-grained access control together with the time sensitive data. A time and attribute factors combined access control is necessary to handle time-sensitive data in public cloud storage. Timed release encryption is a kind of encryption in which owner encrypts a message for the purpose that intended users can decrypt it after a designated time. Apart from access control,the proposed system embeds the TRE and CP-ABE with Redundancy check by which the TAFC with De-duplication system is formed to overcome the problems of time based access control and storage.

Keywords: Cloud Storage, Time-sensitive data, access control, De-duplication

"A NOVEL TIME BASED SECURE DATA HANDLING IN PUBLIC CLOUD WITH DE-DUPLICATION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 7, page no.476-478, July-2018, Available :http://www.jetir.org/papers/JETIR1807314.pdf

"A NOVEL TIME BASED SECURE DATA HANDLING IN PUBLIC CLOUD WITH DE-DUPLICATION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 7, page no. pp476-478, July-2018, Available at : http://www.jetir.org/papers/JETIR1807314.pdf