DES (08) - S-Box permutation ????? Inverse Initial Permutation ????????????

S-Box ?????? ????????????? ?????? 48 bits ??????? permutation ??????? ???? ??????????
(??? ?) ??? ??????? ? 48 bits ??? permutation ?????????? output ?? 32 bits ???? ??????????

(??? ?)

??? function ??? permuted ??????????? 32 bits ???????????? algorithm ?? L0 ?? R1 ????????????? function ??? ??????? 32 bits ??? ???? L0 (32 bits) ??? Exclusive-OR ?????????? ???? ?????????????? equation ????? ?R1=L0?f(R0.K1)? ????????????????? R0 ???? L1 ????? ??????????? assign ??????? ????????????? ?????? ????? L1 ??????????????????? R0 ?? ???-? ??? IP ???????? ??????? R0 (32bits) ??????????
????? L ??? R ??? ???????? ??????????? 16 round ??????????? ??????????????????? R16 ??? L16 ?????????????? ???? R16(32bits) ??? L16(32bits) ???????????? 64 bits ??????????? 64 bits ??? inverse initial permutation (??? ?) ?????????????? ??? final output (cipher text) 64 bits ??? ?????????????????

(??? ?)