Key-based matrix scrambling

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Digitalsd 2012-10-31

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https://ww2.mathworks.cn/matlabcentral/answers/52440-key-based-matrix-scrambling

I have a matrix and I need to scramble its elements in a reversible way using a key based function.It could be a key based permutation. The question: Are there any built-in MATLAB functions or libraries that could help me to perform such operation? any suggestions?

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Answer 1

Jan 2012-10-31

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https://ww2.mathworks.cn/matlabcentral/answers/52440-key-based-matrix-scrambling#answer_63933

编辑：Jan 2012-10-31

在 MATLAB Online 中打开

data    = rand(1, 128);
key     = 12654;
stream0 = RandStream('mt19937ar', 'Seed', key);
RandStream.setDefaultStream(stream0);
index   = randperm(128);
scrambled = data(index);
unscrambled = zeros(1, numel(data));
unscrambled(index) = scrambled;
isequal(data, unscrambled)

This is not tested yet.

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Digitalsd 2012-11-1

The question’s point : if I send you a key-based scrambled matrix, you will be able to extract the original matrix using the same key (symmetric key). If the codes in lines 3 and 4 will force the ‘randperm’ in line 5 to give me the same ‘index‘ permutation when using the same key, I will reach the point. !?

Digitalsd 2012-11-2