Key Independent Retrieval of Chaotic Encrypted Images

Authors:
Ram Ratan
Affiliations:
Defence Research and Development Organisation, Scientific Analysis Group, Delhi, India 110054
Venue:
PReMI '09 Proceedings of the 3rd International Conference on Pattern Recognition and Machine Intelligence
Year:
2009

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Abstract

A chaotic image encryption algorithm based on circular shift functions proposed for high security is analysed in this paper for retrieving encrypted images. Proposed retrieval scheme is key independent and based on divide and conquer attack where neighbourhood similarity characteristic of images is applied. The simulation results show that retrieved images have very good visual perception quality and are as similar as original images. The analysis indicates that above algorithm in present form is insecure and encrypted images can be retrieved efficiently.