1 Given the following input message and key in hexadecimal, compute the values of the bits in position 13, 37, 28, 5 after 1 round of encryption of DES (these bits will fall in LE1 and RE1 as shown in below figure) (bit position 1 is the far left bit, bit 64 is the far right) Message 0123456789abcdef Key 1f1f1f1f1f1f1f1f Output (plaintext) RD 7 LE, LD,7 RE, Input (plaintext) LE RE LD 16 RE RD6 LE, Round 1 Round 16 FK LE RE LD1s RE, RD s LE FK2 Round 2 Round 15 LE RE, LD 14 RE, RD4 4 LE LE14 RE14 LD, RE4 RD2 LE14 Ks Round 15 Round 2 Kys LE15 RES LD, RES RD, LES K16 Round 16 Round 1 K16 LE36 RE16 LD, REG RD, LE6 Input (ciphertext) LE17 REZ Output (ciphertext)

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Question: 1. Given the following input message and key in hexadecimal, compute the values of the bits in position 13, 37, 28, 5 after 1 round

1. Given the following input message and key in hexadecimal, compute the values of the bits in position 13, 37, 28, 5 after 1 round of encryption of DES (these bits will fall in LE1 and RE1 as shown in below figure) (bit position 1 is the far-left bit, bit 64 is the far-right)

Message = 0123456789abcdef

Key = 1f1f1f1f1f1f1f1f

1. Given the following input message and key in hexadecimal, compute the

Output (plaintext) RD 7 = LE, LD,7 = RE, Input (plaintext) LE RE LD 16 = RE RD6 = LE, Round 1 Round 16 FK LE RE LD1s = RE, RD s = LE FK2 Round 2 Round 15 LE RE, LD 14 = RE, RD4 4 = LE LE14 RE14 LD, = RE4 RD2 = LE14 - Ks Round 15 Round 2 - Kys LE15 RES LD, = RES RD, = LES -K16 Round 16 Round 1 -K16 LE36 RE16 LD, = REG RD, = LE6 Input (ciphertext) LE17 REZ Output (ciphertext)

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