Use your 8-digit student number as a one-time pad to encrypt the plaintext message of the...

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Use your 8-digit student number as a one-time pad to encrypt the plaintext message of the same length 0xCDEF89AB. Provide answer as hexidecimal sequence. As an example: Ox indicates a hexadecimal number, for example 0x0 = 0 (decimal) = 0000 (binary) OxABCD would indicate the binary sequence 1010 1011 1100 1101 Use this table to map a hexadecimal value to binary. Show all your calculations. 0x000000 0x1 = 1 = : 0001 0x2= 2 = 0010 0x33 0011 0x4 = 4 0100 0x88 1000 0x99 1001 OxA = 10 = 1010 OxB = 11 = 1011 0xC = 12 = 1100 0xD 13 1101 OxE14 1110 OxF = 15 = 1111 = 0x5 = 5 = 0101 = = = 6 = 0110 0x6 = 0x77 0111 = = (b) (5 marks) A theat A sender is too lazy to generate new keystream when using a stream cipher, so he always re-uses the previous keystream. You intercept ciphertext 0xABCD, which you later find out has plaintext 0x4321. Later you intercept a new ciphertext OxAA6A. What is the plaintext of this second message? Go to Set Use your 8-digit student number as a one-time pad to encrypt the plaintext message of the same length 0xCDEF89AB. Provide answer as hexidecimal sequence. As an example: Ox indicates a hexadecimal number, for example 0x0 = 0 (decimal) = 0000 (binary) OxABCD would indicate the binary sequence 1010 1011 1100 1101 Use this table to map a hexadecimal value to binary. Show all your calculations. 0x000000 0x1 = 1 = : 0001 0x2= 2 = 0010 0x33 0011 0x4 = 4 0100 0x88 1000 0x99 1001 OxA = 10 = 1010 OxB = 11 = 1011 0xC = 12 = 1100 0xD 13 1101 OxE14 1110 OxF = 15 = 1111 = 0x5 = 5 = 0101 = = = 6 = 0110 0x6 = 0x77 0111 = = (b) (5 marks) A theat A sender is too lazy to generate new keystream when using a stream cipher, so he always re-uses the previous keystream. You intercept ciphertext 0xABCD, which you later find out has plaintext 0x4321. Later you intercept a new ciphertext OxAA6A. What is the plaintext of this second message? Go to Set

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Considering the Roll no as 12345678 which is 0001 0010 0011 0100 0101 0110 0111 1000 in hexadecimal ... View the full answer