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Task 1:
1. Consider the following encryption system:Input -> Monoalphabetic Encryption (Key: K1) -> Row Transposition Encryption (Key: K2) -> OutputSuppose the ciphertext Output of the encryption system is:KNTGETRZTXRUQFACTIOSJNZAGTQThe key values are:K1 = QWERTYUIOPLKJHGFDSAZXCVBNMK2 = 627158943Find the corresponding Input plaintext text. Note that the plaintext is an intelligible English text.Note: You must show all your solution steps.
Task 2:1. Explain step by step the operation of DES. 2. In public-key cryptosystems, the RSA is the most commonly used algorithm. Answer the following questions: a) Consider the following equation - D= {(P-1)(Q-1)(E-1)+1}/Ewhere, E is an odd number, P&Q are prime numbers and {(P-1)(Q-1)-1} is evenly divisible by E, N = P X N. Is this scheme equivalent to RSA? Justify your answer. b) In the RSA algorithm, what is the security flaw with choosing e = 1 for the public key? (Hint: the RSA formula for encryption is c = Me mod n). c) Answer the following scenario in relation to the RSA algorithm -1. Suppose you are given a ciphertext C= 61 by a user whose public key is e=11, n=91. Break the code.2. Suppose you have a set of encoded message blocks but you don't have the private key. If someone tells you that they know one of the plaintext blocks has a common factor with n (let n=pq and e is the public key). Does this help you in any way? Explain why and why not?
Attachment:- encryption system.rar
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