Cryptanalysis of a Chaotic Image Encryption Algorithm
Abstract
Line map, an invertible, two-dimensional chaotic encryption algorithm was introduced recently. In this paper, we propose several weaknesses of the method based on standard cryptanalytic attacks. We perform a side-channel attack by observing the execution time of the encryption algorithm and successfully reduce the key space by a factor of 10^4 for a key length of 16 digits. We find the existence of equivalent keys which reduce the key space by a significant margin, even in the absence of any attack. Also, we find that the ciphertext is not sensitive to small changes in the plaintext due to poor diffusion.
Cite
@article{arxiv.0801.0276,
title = {Cryptanalysis of a Chaotic Image Encryption Algorithm},
author = {Nikhil Balaji and Nithin Nagaraj},
journal= {arXiv preprint arXiv:0801.0276},
year = {2008}
}
Comments
11 pages, 4 figures, 1 table. Poster presented at National Conference on Nonlinear Systems and Dynamics, Physical Research Laboratory, Ahmedabad, Jan 3-5, 2008. Made changes to the paper based on Chengqing Li's useful comments