8-Round Feistel Cipher
?
RF
RK2
?
RF
RK1
?
RF
RK4
?
RF
RK3
?
RF
RK6
?
RF
RK5
?
RF
RK8
?
RF
RK7
R8
R9
R1
R0
R5
R4
R5
R4
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