I am reading a research paper on image encryption using chaotic maps.and in between the paper they are using SHA3 encryption to produce 256 bits. I am not able to understand how are they using SHA3 and how are the 32 hash values of the image being obtained. please can somebody guide me on this. some reference enter image description here

  • $\begingroup$ Right now this is impossible to answer, could you please link to said research paper? $\endgroup$ – SEJPM Dec 28 '16 at 13:41
  • $\begingroup$ link.springer.com/article/10.1007/s11071-015-2465-7 $\endgroup$ – user311790 Dec 28 '16 at 13:47
  • $\begingroup$ In this case you have two options: Either include the relevant passages from the paper or contact the authors and ask them. $\endgroup$ – SEJPM Dec 28 '16 at 13:53
  • $\begingroup$ actually The link i have updated has that passage regarding SHA3 $\endgroup$ – user311790 Dec 28 '16 at 13:57
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    $\begingroup$ While the linked article may contain this passage many of us don't have a Springer Link subscription so we cannot access paywalled articles like this one. $\endgroup$ – SEJPM Dec 28 '16 at 13:59

My guess: 256 bits = 32 bytes. So compute the SHA3-hash and use the decimal (in the example) values of the 32 resulting bytes.

  • $\begingroup$ how do i get the hash values can you tell $\endgroup$ – user311790 Dec 28 '16 at 16:05
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    $\begingroup$ I suppose we compute the hash of the picture, it's just a file, so a sequence of bytes as well. $\endgroup$ – Henno Brandsma Dec 28 '16 at 16:28

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