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 
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$\begingroup$ Right now this is impossible to answer, could you please link to said research paper? $\endgroup$ – SEJPM♦ Dec 28 '16 at 13:41
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$\begingroup$ link.springer.com/article/10.1007/s11071-015-2465-7 $\endgroup$ – user311790 Dec 28 '16 at 13:47
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$\begingroup$ 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
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$\begingroup$ actually The link i have updated has that passage regarding SHA3 $\endgroup$ – user311790 Dec 28 '16 at 13:57
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1$\begingroup$ 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
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My guess: 256 bits = 32 bytes. So compute the SHA3-hash and use the decimal (in the example) values of the 32 resulting bytes.
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$\begingroup$ how do i get the hash values can you tell $\endgroup$ – user311790 Dec 28 '16 at 16:05
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1$\begingroup$ 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
