A Dynamic DNA Color Image Encryption Method Based on SHA-512

. 2020 Sep 28;22(10):1091. doi: 10.3390/e22101091

Algorithm 1: The Conditional Shifting Operation

Input: Mandelbrot set M and the channels R₂, G₂, and B₂.

1:
forI = 1:n
2:
find the maximum value of ith column elements of M and denote it as max_i
3:
find the maximum values of the ith row elements of R₂, G₂, and B₂ and denote them as max_ri, max_gi and max_bi, respectively, as follows:
4:
case 1:
5:
ifmax_i < max_bi, then
6:
perform left cyclic shift on ith elements of R₂ for max_i times
7:
else
8:
perform right cyclic shift on ith elements of R₂ for max_i times
9:
end if
10:
end
11:
case 2:
12:
ifmax_i < max_ri then
13:
perform left cyclic shift on ith elements of G₂ for max_i times
14:
else
15:
perform right cyclic shift on ith elements of G₂ for max_i times
16:
end if
17:
end
18:
case 3:
19:
ifmax_i < max_gi then
20:
perform left cyclic shift on ith elements of B₂ for max_i times
21:
else
22:
perform right cyclic shift on ith elements of B₂ for max_i times
23:
end if
24:
end
25:
end for
26:
Finally, when the conditional shifting is finished, R₃, G₃, and B₃ are obtained.