mrdongdonglin / cryptanalysis_ieae

Codes of cryptanalysis of image encryption algorithm based on autoblocking and electrocardiography (IEAE)

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