Cryptanalyzing an image encryption algorithm based on autoblocking and electrocardiography

The paper "cryptanalysis of image encryption algorithm based on autoblocking and electrocardiography" is now available on IEEE: https://ieeexplore.ieee.org/document/8495009. This project contains codes of this paper, LaTeX source codes of this paper can be downloaded: https://arxiv.org/abs/1711.01858. Cite this paper:

IEEE format:

C. Li, D. Lin, J. Lu, F. Hao, "Cryptanalyzing an image encryption algorithm based on autoblocking and electrocardiography," IEEE MultiMedia, arXiv:1711.01858, 2018.

@ARTICLE{Cqli:block:IM18,
  author =       {Chengqing Li and Dongdong Lin and Jinhu L\"u and Feng Hao},
  title =        {Cryptanalyzing an image encryption algorithm based on autoblocking and electrocardiography},
  journal =      {IEEE MultiMedia, arXiv:1711.01858},
  year =         {2018},
  LatexSource =  {https://arxiv.org/abs/1711.01858},
}

Getting Started

The matlab codes are complete and executable. To encrypt a gray scale image, please use encrypt.m, and use decrypt.m to decrypt a cipher image. The file get_key.m is used to get the equivalent version of the secret key of IEAE with a pair of plain image and cipher image. At last, kpa.m is used to decipher IEAE.

Initlization

pimg = imread('../../data/Baboon.bmp');
a=1; b=1; w1=50; w2=50; mu=3.999; mu1=20; mu2=15; N=3; p1=16; p2=16;
[v, D, C0] = init(pimg, p1, p2, a, b, mu, mu1, mu2);

Encryption

cimg = encrypt(pimg, p1, p2, v, D, C0);

Decryption

pimg = decrypt(cimg, p1, p2, v, D, C0)

Known-plaintext Attack

• Encrypt rounds

T = 1;

• Another cipher image encrypted with the same secret keys.

lena = imread('../../data/Lena.bmp');
[lena_e, ~, ~, ~] = encrypt(lena, p1, p2, v, D, C0);
for i =1:T-1
    [lena_e, ~, ~, ~] = encrypt(lena_e, p1, p2, v, D, C0);
end

• Get the equivalent version of the secret key

[vD, blk_coeff, ~] = get_key(lena, lena_e, p1, p2, T);

• attack

aimg = kpa(cimg, vD, blk_coeff);

TODO

python codes of IEAE in folder cipher