The data authentication algorithm, can be defined as using the cipher block chaining (CBC) mode of operation of DES with an initialization vector of zero (Figure 12.7). Show that the same result can be produced using the cipher feedback mode.

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Time = 1 Time = 2 D D (64 bits) HI DES DES K-> encrypt encrypt 0 0 (64 bits) K (56 bits) Time = N - 1 DN-1 K-> Figure 12.7 Data Authentication Algorithm (FIPS PUB 113) DES encrypt ON-1 K-> Time = N DN DES encrypt ON DAC (16 to 64 bits)