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Computer Science/Encryption, please help. You find out that your University is using an authenticated messaging system that is vulnerable to a length extension attack, because it uses an iterative hash function with the insecure MAC construction t = h(K || m). By eavesdropping on the network you intercept the following message m from your professor to the administration: “Set final course grade to A for J. Smith,” along with its tag t. Give an example of a believable message that you could forge and send using a length-extension attack, and describe how the attack would work. Specify how you would use the hash function and what pieces of data you would send.

Computer Science/Encryption, please help. You find out that your University is using an authenticated messaging system that is vulnerable to a length extension attack, because it uses an iterative hash function with the insecure MAC construction t = h(K || m). By eavesdropping on the network you intercept the following message m from your professor to the administration: “Set final course grade to A for J. Smith,” along with its tag t. Give an example of a believable message that you could forge and send using a length-extension attack, and describe how the attack would work. Specify how you would use the hash function and what pieces of data you would send.

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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Computer Science/Encryption, please help.

You find out that your University is using an authenticated messaging system that is vulnerable to a length extension attack, because it uses an iterative hash function with the insecure MAC construction t = h(K || m). By eavesdropping on the network you intercept the following message m from your professor to the administration: “Set final course grade to A for J. Smith,” along with its tag t. Give an example of a believable message that you could forge and send using a length-extension attack, and describe how the attack would work. Specify how you would use the hash function and what pieces of data you would send. 

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