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A Wavelet based Digital Watermarking Method using Thresholds on Intermediate Bit Values

researchers are concentrating to provide a high confidentiality and data integrity to protect against unauthorized access. The network security is becoming a very important and crucial aspect as the number of data being exchanged and number of users being communicated on the internet increases rapidly day by day. Therefore confidentiality of users and data integrity are required to protect against unauthorized access. To address the issues of authentication, the present paper proposes a novel wavelet based Digital Watermarking (DW) approach with two steps. In the first step a Threshold, based on Intermediate Bit Values (TIBV) of image pixels is proposed by selecting the image pixel for inserting the watermark. In the second step Alattar"s method is used for inserting the Digital Watermark (DW) bits in the selected pixels of the first step. These two steps make the proposed TIBV-DW method as more effective and difficult to break. To test the efficacy of the proposed TIBV- DW method, various statistical measures by considering combinations of various attacks are evaluated on various experimental images, which indicate high robustness, imperceptibility, un-ambiguity, confidentiality and integrity of the present method.