Реферат: Шифрование DES - теория и практика

L(5) = R(4) = 10001000100101110110000001101000

E(R5) = 111010100110100010101111110011110011111100000111

R(5) XOR K(6) = 000010101111101011011101101011010110001001100101

S(1..8) = 01000010100111101110010001001110

P = 01001101010101101001000111101000

R(5) XORL(5) = 11000101110000011111000110000000 = R(6)

L(6) = R(5) = 11010011000101111001100111100011

E(R6) = 011000001011111000000011111110100011110000000001

R(6) XOR K(7) = 110001000110110001110001011101101001010100111011

S(1..8) = 01011110010010011000100110010101

P = 11010011000010011010100001110011

R(6) XOR L(6) = 00000000000111100011000110010000 = R(7)

L(7) = R(6) = 11000101110000011111000110000000

E(R7) = 000000000000000011111100000110100011110010100000

R(7) XOR K(8) = 101001100101001110101110111111110110001011110000

S(1..8) = 01001010010111110011101010010000

P = 11110110011010011001000011000001

R(7) XOR L(7) = 00110011101010000110000101000001 = R(8)

L(8) = R(7) = 00000000000111100011000110010000

E(R8) = 100110100111110101010000001100000010101000000010

R(8) XOR K(9) = 101111000010111000000011111110111011000001000010

S(1..8) = 01110001010110001110000010110010

P = 00000111000001111100011011000011

R(8) XOR L(8) = 00000111000110011111011101010011 = R(9)

L(9) = R(8) = 00110011101010000110000101000001

E(R9) = 100000001110100011110011111110101110101010100110

R(9) XOR K(10) = 101011111011100110100010001010100010110110011010

S(1..8) = 10010101100101101010111010000000

P = 00010101111000000101000110011011