Cryptanalysis and DB Security - IT Assignment Help

Assignment Task:

Task:

1.Consider an automated cash deposit machine in which users provide a card or an account number to deposit cash. Give examples of confidentiality, integrity, and availability requirements associated with the system, and, in each case, indicate the degree of importance of the requirement.)

2. One way to solve the key distribution problem is to use a line from a book that both the sender and the receiver possess. Typically, at least in spy novels, the first sentence of a book serves as the key. The particular scheme discussed in this problem is from one of the best suspense novels involving secret codes, Talking to Strange Men, by Ruth Rendell. Work this problem without consulting that book! Consider the following message: This ciphertext was produced using the first sentence of The Other Side of Silence (a book about the spy Kim Philby): The snow lay thick on the steps and the snowflakes driven by the wind looked black in the headlights of the cars. A simple substitution cipher was used. [15]

(a)What is the encryption algorithm? Please describe the algorithm, and show the plaintext. [5]

(b)How secure is the simple substitution cipher? [30] 3. Given an Affine Cipher below from f(_) = __k+j mod 26, your task is to determine the plaintext. In your solution, please give a clearly written description of the steps you followed to decrypt the ciphertext, e.g., all statistical analysis and computations you performed.

4.We describe a special case of a Permutation Cipher. Let m, n be positive integers. Write out the plaintext, by rows, in m n rectangles. Then form the ciphertext by taking the columns of these rectangles. For example, if m = 4, n = 3, then we would encrypt the plaintext “CRYPTOGRAPHY” The ciphertext would be “CTAROPYGHPRY”.

(a)Given a ciphertext encrypted with the above method, describe how you would decrypt the ciphertext (given values for m and n).

(b)Decrypt the following ciphertext, which was obtained by using this method of encryption:

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