Abstract
A new image encryption scheme based on Tangent-Delay Ellipse Reflecting Cavity-map System(TD-ERCS)was proposed.In the proposed scheme,an external secret key of 64-bit and a TD-ERCS were employed.The initial condition for the TD-ERCS were derived using the external secret and then random numbers in [-1,1] were generated.The range [-1,1] was divided into 32 non-overlapping intervals and arranged into eight different groups.Further,eight different types of operations were used to encrypt the pixels of an image and one of them was used for a particular pixel decided by the outcome of the TD-ERCS.After encrypting each block of 24 pixels of the image,the secret key was modified.The simply designed encryption scheme can work on digital image at any size,while its high security to certain analysis and attack method is proved by statistical analysis and key sensitivity tests.
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