Does Threefish encryption unresistant the differential attacks?

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Ansam Osamah
Ansam Osamah on 28 Sep 2020
Commented: Ansam Osamah on 28 Sep 2020
I applied Threefish encryption on grayscale image pixels (256*256). For analysis, I computed NPCR and UACI and found the following results:
NPCR = 0.0488 UACI = 0.0135 I use the following Matlab code for both NPCR and UACI:
D=(c1~=c2); % c1, c2 are cipher images with the same plain image but with 1 pixel difference
NPCR_m=sum(sum(D))/(256*256);
NPCR_m=NPCR_m*100
dif=(abs(double(c1)-double(c2)))/255;
UACI=sum(sum(dif))/(256*256);
UACI=UACI*100
Does Threefish encryption unresistant the differential attacks, or I made some mistakes in calculation?

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