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  3. 1 vernam cipher for this problem we use the standard...

Question: 1 vernam cipher for this problem we use the standard...

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1. Vernam cipher For this problem, we use the standard letter-to-number conversion A- 0, B 1, C (a.) (5 points) Encrypt the following message, knowing that it is a Vernam cipher with the short keys U (10.5) and V = (17, 23, 6) Return to base (b.) (4 points) Suppose now we use the short keys U - (8,3) and V (19, 25, 8) What is the long key K in this case? Compare this with the long key K you ob- tained from part (a) and discuss how U and U, V and V, K and K relate to one another (c.) The follow ing message was encrypted using a Vernam cipher knowing that the short keys U and V were of length (U) 3 and V)-4, and the original plain-text starts with K EEP CA (c.1) (3 points) Reconstruct the long key K. Hint: . Try to match the first 6 letters in the plaintext and ciphertext together . You may pick an arbitrary value for the first letter in either U or V then use that to break the remaining bits of the keys (use the idea from parts (a.) and (b.)) (c.2.) (3 points) Decrypt the message

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