A cryptography student has accidentally used the same keystream to encrypt two different messages, M1M1 and M2M2. We know that the ciphertexts are C1=0x42e8ede51496d10cC1=0x42e8ede51496d10c and C2=0xa5ec5666da7419d0C2=0xa5ec5666da7419d0. We also happen to know that M1=0x713dc2f31c1e6c87M1=0x713dc2f31c1e6c87. 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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