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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.

Because of a physical character of a tag, the security module to RFID Tag is required a low electronic power and a performance of more faster speed. Recently, there are so many researching part about using RFID. But they have a security problems for a physical characteristic. One of solving this problems is using the cryptograph algorithm. But it has also some limitation when it apply to Tags. To overcome it, we designed and developed the 128bits SEED(called RT-SEED) algorithm to use in Tag.

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