Two companies would like to communicate confidentially online. They also seek integrity and authenticity of the communication between each other. They require secret-key cryptography to achieve these goals. It is important for the companies that the ciphertexts exchanged are authentic and have not been altered in transit. Note that the communication between the companies comes in the form of short messages which would fit into one plaintext block of AES-128. Which of the following solutions is ideal for this scenario, where the companies share 2 secret keys, k1 which they can use for encryption and k2 which they can use for issuing and verifying MACs? Choose only 1 answer. O 1. T-HMACK2 (M) 2. C= AES-128-ENCk1(T) 3. Send C and T to the other company O 1. C=AES-128-ENCk1(M) 2. T-HMACK2(M) 3. Send C and T to the other company Any of the 3 solutions would suffice 1. C-AES-128-ENCk1(M) 2. T=HMACK2 (C) 3. Send C and T to the other company

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Two companies would like to communicate confidentially online. They also seek integrity and authenticity of the
communication between each other. They require secret-key cryptography to achieve these goals. It is important for the
companies that the ciphertexts exchanged are authentic and have not been altered in transit. Note that the
communication between the companies comes in the form of short messages which would fit into one plaintext block of
AES-128.
Which of the following solutions is ideal for this scenario, where the companies share 2 secret keys, k1 which they can use
for encryption and k2 which they can use for issuing and verifying MACs? Choose only 1 answer.
O 1. T=HMACK2 (M)
2. C= AES-128-ENCk1(T)
3. Send C and T to the other company
O 1.C-AES-128-ENCk1(M)
2. T-HMACK2(M)
3. Send C and T to the other company
Any of the 3 solutions would suffice
1. C-AES-128-ENCk1(M)
2. T=HMACk2 (C)
3. Send C and T to the other company
Transcribed Image Text:Two companies would like to communicate confidentially online. They also seek integrity and authenticity of the communication between each other. They require secret-key cryptography to achieve these goals. It is important for the companies that the ciphertexts exchanged are authentic and have not been altered in transit. Note that the communication between the companies comes in the form of short messages which would fit into one plaintext block of AES-128. Which of the following solutions is ideal for this scenario, where the companies share 2 secret keys, k1 which they can use for encryption and k2 which they can use for issuing and verifying MACs? Choose only 1 answer. O 1. T=HMACK2 (M) 2. C= AES-128-ENCk1(T) 3. Send C and T to the other company O 1.C-AES-128-ENCk1(M) 2. T-HMACK2(M) 3. Send C and T to the other company Any of the 3 solutions would suffice 1. C-AES-128-ENCk1(M) 2. T=HMACk2 (C) 3. Send C and T to the other company
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