Abstract
In the current era, transmission and storing of medical data in the digital form is of great concern and thus the requirement for content authentication has aroused. As a solution to these, digital watermarking techniques and encryption schemes have been used to secure medical data like medical images. In this paper a combination of two algorithms to provide image authentication for medical images in the compressed format is proposed. In the proposed method, the watermark image is encrypted using the Enhanced modified RC6 block cipher (EMRC6) algorithm and the encrypted watermark image is watermarked using the simple Least significant Bit (LSB) watermarking technique. The watermarked output image shows no visual imparity and the watermark which has been extracted has no visual difference. The test results show that the watermarked image has high quality and the watermark is very secure. Also the PSNR value of proposed method is 44.966 on an average and 43.0633 for the existing system where LSB technique is integrated with MRC6 for security of watermark. Hence the work is aimed to increase the embedding volume and make the watermark more secure which is the basic requirement of medical image security.
Highlights
In the recent era where the data are being transformed into digital content, the need for security of medical imagesHow to cite this paper: Mary, S.J.J., Christopher, C.S. and Joe, S.S.A. (2016) Novel Scheme for Compressed Image Authentication Using Least significant Bit (LSB) Watermarking and Enhanced Modified Version of RC6 (EMRC6) Encryption
Puneet analysed various image watermarking using LSB algorithms and the results show that the hiding of the secret data in the first bit is without noticeable distortion on it [28]
The proposed system is aimed at combining LSB watermarking method with Enhanced Modified Version of RC6 (EMRC6) encryption scheme to provide content authentication for compressed images
Summary
In the recent era where the data are being transformed into digital content, the need for security of medical images. (2016) Novel Scheme for Compressed Image Authentication Using LSB Watermarking and EMRC6 Encryption. Encryption schemes are used to provide security to digital data like text, image, audio, video, etc. In addition to watermarking techniques, encryption schemes increase the reliability and security of digital content. Lot of researchers combined watermarking schemes with encryption algorithms to increase the security of the digital content. The symmetric block cipher RC5 which is more secure and robust than RC4 due to its increased number of rounds to work with the watermarking schemes used in [15] was proposed by Gayathri I.K. Later to overcome the disadvantages of RC6 an Enhanced version of RC6 (ERC6) is used It has 8 working registers and it acts on 256-bits input/output blocks.ERC6 encrypts at about 17.3 MB/sec making it about 1.7 times faster than RC6. The watermark image in encrypted using any encryption scheme and the output encrypted watermark is watermarked using any spatial or frequency domain watermarking algorithm producing the final watermarked output
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