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2) Vernam cipher (a) Consider the following letter encodings: Letter A E I M O R T V Encoding 000 001 010 011 100 101 110 111 A message M = MARIO is...

2) Vernam cipher (a) Consider the following letter encodings: Letter A E I M O R T V Encoding 000 001 010 011 100 101 110 111 A message M = MARIO is Vernam encrypted into ciphertext C = AOAMV. Find the corresponding encryption key (note that it should be 5 letters long). Provide details of your cryptanalysis. Vague answer will not be accepted. (b) Consider the following two ciphertexts C1= MAOEE and C2=RTITR that are obtained by Vernam encrypting messages M1 and M2, respectively, using the same encryption key. The letter encodings is the same as shown in Step (a). The encrypted messages are two names. Let mi,k be the kth letter in the message Mi. The following is known about the messages (names): m1,1 = R and m2,4 = T. Using this limited information, try to recover messages M1 and M2, as well as the encryption key.

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