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SEDASC: SECURE DATA SHARING IN CLOUDS

ABSTRACT

In this paper, we propose the Secure Data Sharing in Clouds (SeDaSC) methodology that provides: data confidentiality and integrity; access control; data sharing (forwarding) without using compute-intensive reencryption; insider threat security; and forward and backward access control. The SeDaSC methodology encrypts a file with a single encryption key. Two different key shares for each of the users are generated, with the user only getting one share. The possession of a single share of a key allows the SeDaSC methodology to counter the insider threats. The other key share is stored by a trusted third party, which is called the cryptographic server. We implement a working prototype of the SeDaSC methodology and evaluate its performance based on the time consumed during various operations.

EXISTING SYSTEM	PROPOSED SYSTEM
EXISTING SYSTEM:- Secure data sharing among a group that counters insider threats of legitimate yet malicious users is an important research issue. A separate key for every user is a cumbersome solution. The data must be separately encrypted for every user in such a scenario.	PROPOSED SYSTEM:- The proposed methodology provides data confidentiality, secure data sharing without reencryption, access control for malicious insiders, and forward and backward access control. We proposed the SeDaSC methodology, which is a cloud storage security scheme for group data. The proposed methodology provides data confidentiality.
EXISTING ALGORITHM :- Symmetric key algorithm.	PROPOSED ALGORITHM :- Key Generation and Encryption algorithm.
ALGORITHM   DEFINITION:- To improve upon the scalability of the above solutions, one-to-many encryption methods such as ABE can be used.	ALGORITHM DEFINITION:- In a ciphertext policy attribute-based encryption scheme, each user’s private key is associated with a set of attributes representing their capabilities.
DRAWBACKS:- Secure data sharing among a group that counters insider threats of legitimate yet malicious users is an important research issue. The forward and backward access control is ensured by only allowing user access to a portion of the key that prohibits insiders to launch individual or coordinated attacks on the data.	ADVANTAGES:- We implement a working prototype of the SeDaSC methodology and evaluate its performance based on the time consumed during various operations. The SeDaSC methodology utilizes symmetric encryption, and the access to multiple users is achieved through key management, as explained in the preceding section.