A cryptography student has accidentally used the same keystream to encrypt two different messages, M1M1 and M2M2. We know that the ciphertexts are C1=0x5f2568184c2238f1C1=0x5f2568184c2238f1 and C2=0xc5bf0ed68609f02aC2=0xc5bf0ed68609f02a. We also happen to know that M1=0x412b890112d9615cM1=0x412b890112d9615c. a) What is M2M2 in hexadecimal? Please give your answer a leading 0x and use lowercase letters only. b) What is the keystream? Please give your answer a leading 0x and use lowercase letters only. Hint: These are all 8 byte numbers and will fit in an unsigned long type on most systems.

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