دانلود رایگان مقاله انگلیسی پیاده سازی یک مکانیزم نهان نگاری امن بر اساس رمزنگاری و تطبیق زوج های بیت - الزویر 2018

abstract

Watermarking is one of the most vital digital information hiding technique, which can be used with cryptography mechanism for providing more security to digital data. In image watermarking mechanism mostly LSB substitution is used on the cover image for hiding the secret watermark. In this paper, a novel technique based on the matching of bit pairs and symmetric key cryptography is proposed. Pixel bits of original image and encrypted watermark image are arranged in pairs. The pixel bits are represented in pairs following the proposed algorithm, then the encrypted watermark pixel bit pairs are compared with all bit pairs of original image and accordingly the replacement of bit pairs takes place with the respective matched pair assigned number binary equivalent. If no match is found then go for replacing the 0th pair with watermark bits and replace the two LSB with the value of pair number 0. The proposed mechanism shows good quality of watermarked image along with good PSNR values with a good payload. By comparing the results with some existing algorithms, the proposed scheme shows the valuable results.

5. Conclusions

In this paper bit pairs similarity based LSB replacement watermarking mechanism is proposed. This mechanism is a new concept and which is different from all the previous mechanisms because its main focus is on bit pairs similarity. In this technique to make the watermark more secured, symmetric key cryptography is used and the data bits are arranged in pairs following the proposed scheme, which is different from all the existing techniques. The proposed technique is applied to 15 different grayscale test images. The proposed scheme is more secure, robust and higher payload based on good factors of imperceptibility proved from the results of the experiments we have done.