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Two entities who share a key k decided to use a block cipher ENC in Cipher Feedback (CFB) mode and a fixed IV value (i.e. the IV does not change) to build a MAC scheme to authenticate messages they exchange. More concretely, to sign a single-block message M, the MAC tag is computed as T= MENCK (IV), where denotes XOR. Note that all messages contain one block only. Is this MAC construction existentially unforgeable? O Yes O No

Two entities who share a key k decided to use a block cipher ENC in Cipher Feedback (CFB) mode and a fixed IV value (i.e. the IV does not change) to build a MAC scheme to authenticate messages they exchange. More concretely, to sign a single-block message M, the MAC tag is computed as T= MENCK (IV), where denotes XOR. Note that all messages contain one block only. Is this MAC construction existentially unforgeable? O Yes O No

Computer Networking: A Top-Down Approach (7th Edition)
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 entities who share a key k decided to use a block cipher ENC in Cipher Feedback (CFB) mode and a fixed IV value (i.e. the IV does not change) to build a MAC scheme to authenticate messages they exchange. More concretely, to sign a single-block message M, the MAC tag is computed as T= MENCK (IV), where denotes XOR. Note that all messages contain one block only. Is this MAC construction existentially unforgeable? O Yes O No
Transcribed Image Text:Two entities who share a key k decided to use a block cipher ENC in Cipher Feedback (CFB) mode and a fixed IV value (i.e. the IV does not change) to build a MAC scheme to authenticate messages they exchange. More concretely, to sign a single-block message M, the MAC tag is computed as T= MENCK (IV), where denotes XOR. Note that all messages contain one block only. Is this MAC construction existentially unforgeable? O Yes O No
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