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EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT:-

In the existing deduplication system, each user is issued a set of privileges during system initialization.

 Each file uploaded to the cloud is also bounded by a set of privileges to specify which kind of users is allowed to perform the duplicate check and access the files.

 Before submitting his duplicate check request for a file, the user needs to take this file and his own privileges as inputs. The user is able to find a duplicate for this file if and only if there is a copy of this file and a matched privilege stored in cloud.

PROPOSED CONCEPT:-

In the proposing system, we .eliminating duplicate copies of repeating data and has been widely used in cloud storage to reduce the amount of storage space and save bandwidth.  To protect the privacy of sensitive data while supporting deduplication, the convergent encryption technique has been proposed to encrypt the data before outsourcing .To better protect data security, this paper makes the first attempt to formally address the problem of authorized data deduplication.

EXISTING TECHNIQUE:

 Symmetric encryption technique

PROPOSED TECHNIQUE:-

 Convergent encryption technique

TECHNIQUE DEFNITION:-

Symmetric encryption uses a common secret key  to encrypt and decrypt information. 

TECHNIQUE DEFNITION:-

A user  derives a convergent key from each original data copy and encrypts the data copy with the convergent key.

DRAWBACKS:-

    The user needs to know private key.

    Less protect security

             This deduplication systems cannot   supportdifferential authorization duplicate   check.

ADVANTAGES:-

The user don’t needs to know private key

   Better protect security

This deduplication systems can support differential authorization duplicate   check.