How should i calculate NPCR and UACI values to test the differential attacks for a image encryption method using Fractional fourier transform and chaos

1 Jul 2012
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Updated 25 Sep 2017
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i am implementing image encryption using Fractional fourier transform and chaos and i am not getting the correct results for (NPCR>0.995 and UACI>0.333) How should i calculate these values.

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Asked:

Shobha Hiremath
Shobha Hiremath
on 1 Jul 2012

Commented:

Walter Roberson
Walter Roberson
on 25 Sep 2017

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