41. Which of the following cipher systems uses polyalphabetic substitution? A. Vigenère B. Substitution C. Transposition D. Shift 42. Which encryption algorithm can have key sizes of 128, 192, and 256 bits, with the key size affecting the number of rounds used in the algorithm? A. SHA B. RC C. AES D. DES 43. Which of the following security principles ensures that the sender and the recipient of a message are informed that the message was not altered in transmission? A. SHA B. RC C. AES D. DES 44. Which of the following components is provided by digital signatures? A. Confidentiality and integrity B. Integrity and nonrepudiation C. Integrity and availability D. Nonrepudiation and confidentiality 45. Which of the following is combined with the resulting certificate after the certificate server constructs and populates a digital certificate? A. CA's private key B. CA's public key C. User's private key D. User's public key
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Digital signatures provide integrity and non-repudiation. Therefore, the correct answer is B. Integrity and non-repudiation. Show more…
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Question 2 [25 marks] You have a (single block) ciphertext message (in binary): 1000 1011 0111 1010 Use your Student ID number to obtain a 16-bit key as follows: Key (in decimal) = ID mod 65536 a) Using Simplified AES (S-AES), manually decrypt the ciphertext using your key. You must show and explain all steps in your decryption. b) Compare AES to DES. For each of the following elements of DES, indicate the comparable element in AES or explain why it is not needed in AES. a. XOR of subkey material with the input to the f function b. XOR of the f function output with the left half of the block c. The f function d. Permutation P e. Swapping of halves of the block
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which of the tasks can "public key cryptography" achieve (either directly or indirectly)? Select one or more that applies. Provide your brief explanation on an answer sheet. a) Authentication between two remote parties b) Secure storage of data on insecure media c) Non-repudiation d) Transmitting data privately over an insecure communication channel
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A secure email system is expected to provide confidentiality, sender's non-repudiation, and message integrity. Alice uses three keys to achieve this goal. The three keys are Alice's private key (KA-), Bob's public key (Kg*), and a randomly generated symmetric key (Ks). The encryption procedure is shown below: How can Bob 1) decrypt the data, 2) verify the message's integrity, and 3) verify the sender's non-repudiation? Describe the detailed steps (including the formulas) and show your work.
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