The transfer of image in the digital world plays a very important role, their security is an important issue, and encryption is one of the ways to ensure security. Few applications like medical image security needs to secure only selected region of the image. This work proposes a selective encryption approach for medical images. The approach based on Grain-128 which provides the facilities of implementation of selective image encryption and decryption. Several tests are done in order to prove the approach performance including visual tests, key sensitivity, entropy analysis and correlation coefficient analysis.
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