Question # 1: Use the Multiplicative Cipher method to encrypt the following plaintext: We will succeed in our venture Key length K = 7 You must show all the steps of your work Question # 2: Use the additive cipher with key = 15 to decrypt the message “WTAAD”. You must show all the steps of your work Question # 3: Use the concept of a one-way hash function to encrypt the following name into a 9 x 9 - dimensional database table. Jonathan Lee a) How many rows and columns are there on this table b) Which indices is Jonathan on this table c) Why are hash functions relevant in database encryption? d) What would you do to remedy the problem of index congestion on your database? You must show all the steps of your work Question # 4: Use the multiplicative method to decrypt the following ciphertext. MADWU Key = 5 You must show all the steps of your work Question # 5: use the XOR technique to encrypt the following statement before transmission: The quick brown fox jumps over the lazy dog

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Fundamentals of blockchaining

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