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RRW—A Robust and Reversible Watermarking

Technique for Relational Data

ABSTRACT

Watermarking is advocated to enforce ownership rights over shared relational data and for providing a means for tackling data tampering. When ownership rights are enforced using watermarking, the underlying data undergoes certain modifications; as a result of which, the data quality gets compromised. Reversible watermarking is employed to ensure data quality along-with data recovery. However, such techniques are usually not robust against malicious attacks and do not provide any mechanism to selectively watermark a particular attribute by taking into account its role in knowledge discovery. Therefore, reversible watermarking is required that ensures; (i) watermark encoding and decoding by accounting for the role of all the features in knowledge discovery; and, (ii) original data recovery in the presence of active malicious attacks. In this paper, a robust and semi-blind reversible watermarking (RRW) technique for numerical relational data has been proposed that addresses the above objectives.

EXISTING SYSTEM	PROPOSED SYSTEM
EXISTING SYSTEM:-  Experimental studies prove the effectiveness of RRW against malicious attacks and show that the proposed technique outperforms existing ones. According to literature, existing reversible watermarking techniques, do not take into account the mutual information measure for determining relative importance of features.	PROPOSED SYSTEM:- In this paper, a novel robust and reversible technique for watermarking numerical data of relational databases is presented. The main contribution of this work is that it allows recovery of a large portion of the data even after being subjected to malicious attacks.
EXISTING ALGORITHM:- Reversible Algorithm (RA).	PROPOSED  ALGORITHM:- Watermark Decode and Encode Algorithm.
ALGORITHM  DEFINITION:- Most of the algorithms are certain, and the whole process is reversible. Thus, the attacker can seek the vulnerability from multiple angles. Once the content of embedded watermark is open, the attacker will make use of it to crack the embedding algorithm.	ALGORITHM  DEFINITION:- WDE—an optimization algorithm is employed in the robust and reversible watermarking technique (RRW) proposed in this paper to achieve an optimal solution that is feasible for the problem at hand and does not violate the defined constraints.
DRAWBACKS:- Some of the hackers able to find the data or hack the data from the existing techniques..	ADVANTAGES:- The trust management between data owners and the receivers. Data should be effectively transfered .