Fundamentals of digital image processing
Fundamentals of digital image processing
The image processing handbook (2nd ed.)
The image processing handbook (2nd ed.)
Handbook of Applied Cryptography
Handbook of Applied Cryptography
A Chaotic Image Encryption Scheme Based on Circular Bit Shift Method
ICYCS '08 Proceedings of the 2008 The 9th International Conference for Young Computer Scientists
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Cryptographically, an encryption algorithm should be strong enough so that one could not extract any information from encrypted data. A graphical encryption method proposed in [1] for the security of computer data is cryptanalysed in this paper. There are some regions left unchanged and clearly visible in graphically encrypted images. Key independent decryption of graphically encrypted images is proposed for recovery of intelligible information. Decryption scheme is based on neighbourhood similarity characteristics of adjacent pixels. Simulation results show that the decrypted images obtained by the proposed scheme are quite intelligible to understand. The graphical encryption method in present form is not suitable for security applications as encrypted images can be decrypted easily.