Secure Cloud Storage is an online platform for storing user data with sharing facilities among other users. The data is optionally encrypted before storing and decrypted on download by the system and the process is transparent to the end user. The platform also provides marking data private or public such that all public data are visible to end user and can perform search or download request to the owner. The data owner or user can audit all such request and grant download access to individual or multiple files accordingly. Each file on our system is encrypted using different AES key and the real challenge come when multiple file needs to be shared between users. This constraint is addressed by applying a concept known as Key Aggregation which states the generation of constant size key for a single or multiple files and thereby end user can easily decrypt the shared files.

Data Sharing, Key Aggregation, Java Keystore, Private Key Cryptography, Encryption, Decryption

[1]. Cheng-Kang Chu, Sherman S.M. Chow, Wen-Guey, Tzeng, Jianying Zhou and Robert H. Deng, "Key-Aggregate Cryptosystem for Scalable Data Sharing in Cloud Storage” IEEE Transactions On Parallel and Distributed System, Vol 25, No. 2 February 2014.
[2]. Mewada, Shivlal, Arti Sharivastava, Pradeep Sharma, S. S. Gautam, and N. Purohit. "Performance Analysis of Encryption Algorithm in Cloud Computing.", International Journal of Computer Sciences and Engineering Vol.-3(2), PP(83-89) Feb 2015,
[3]. Ramakrishna Jadhav1, Snehal Nargundi,"A Review On Key-Aggregate Cryptosystem For Scalable Data Sharing In Cloud Storage", IJRET: International Journal of Research in Engineering and Technology, Volume: 03 Issue: 11 | Nov-2014.
[4]. Shivlal Mewada, Sharma Pradeep, Gautam S.S., “Exploration of Efficient Symmetric Algorithms”, 2016 3rd International Conference on Computing for Sustainable Global Development (INDIACom)”, pp(663 – 666), March, 2016,
[5]. Wang, S. S. M. Chow, M. Li, and H. Li, “Storing Shared Data on the Cloud via Security Mediator,” in International Conferenceon Distributed Computing Systems - ICDCS 2013. IEEE, 2013.
[6]. M.Chase and S. S. M. Chow, “Improving Privacy and Security in Multi-Authority Attribute-Based Encryption,” in ACM Conferenceon Computer and communications security Pp 121-130.
[7]. Anjali Nigam, Vineet Singh, "Securing Data Transmission in Cloud using Encryption Algorithms", International Journal of Computer Sciences and Engineering, Volume-04, Issue-06, Page No (21-25), Jun -2016, E-ISSN: 2347-2693
[8]. Shivlal Mewada, Sharma Pradeep, Gautam S.S., “Classification of Efficient Symmetric Key Cryptography Algorithms”, International Journal of Computer Science and Information Security (IJCSIS) USA, Vol. 14, No. 2, pp (105-110), Feb 2016
[9]. Sadiya Shakil and Vineet Singh, "Security of Personal Data on Internet of Things Using AES", International Journal of Computer Sciences and Engineering, Volume-04, Issue-06, Page No (35-39), Jun -2016, E-ISSN: 2347-2693
[10]. R. Durga Prasad, R.N.D.S.S Kiran, Andey Krishnaji, "Advanced Data Encryption/Decryption using Multi Codes for One Character", International Journal of Computer Sciences and Engineering, Volume-03, Issue-09, Page No (34-38), Sep -2015, E-ISSN: 2347-2693
[11]. Shivlal, P Sharma, S.S Gautam, “Exploration of Efficient Symmetric AES Algorithm”, 2016 Symposium on Colossal Data Analysis and Networking (CDAN), pp(1-5), Mar, 2016. Doi: 10.1109/CDAN.2016.7570921