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PQ12. A bank which manages 100,000 accounts has correspondent relationships with other banks of comparable size in numbers of accounts managed. For same day value payments messages it allows payments of between $10,000 and $1,000,000 in multiples of $1,000 to be transmitted and appends a 16-bit MAC to each payment message which is created using a key shared with the correspondent bank. If the payment message contains the home account number, the payment figure and the destination account number, how many possible payment messages to a specified correspondent bank will have the same MAC? If the payment clerk is able to run dummy messages through his system to check that a MAC is created, how many messages would he try before he is likely to find two with the same MAC for a specified destination bank?

PQ12. A bank which manages 100,000 accounts has correspondent relationships with other banks of comparable size in numbers of accounts managed. For same day value payments messages it allows payments of between $10,000 and $1,000,000 in multiples of $1,000 to be transmitted and appends a 16-bit MAC to each payment message which is created using a key shared with the correspondent bank. If the payment message contains the home account number, the payment figure and the destination account number, how many possible payment messages to a specified correspondent bank will have the same MAC? If the payment clerk is able to run dummy messages through his system to check that a MAC is created, how many messages would he try before he is likely to find two with the same MAC for a specified destination bank?

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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PQ12. A bank which manages 100,000 accounts has correspondent relationships with other banks of comparable size in numbers of accounts managed. For same day value payments messages it allows payments of between $10,000 and $1,000,000 in multiples of $1,000 to be transmitted and appends a 16-bit MAC to each payment message which is created using a key shared with the correspondent bank. If the payment message contains the home account number, the payment figure and the destination account number, how many possible payment messages to a specified correspondent bank will have the same MAC? If the payment clerk is able to run dummy messages through his system to check that a MAC is created, how many messages would he try before he is likely to find two with the same MAC for a specified destination bank?
Transcribed Image Text:PQ12. A bank which manages 100,000 accounts has correspondent relationships with other banks of comparable size in numbers of accounts managed. For same day value payments messages it allows payments of between $10,000 and $1,000,000 in multiples of $1,000 to be transmitted and appends a 16-bit MAC to each payment message which is created using a key shared with the correspondent bank. If the payment message contains the home account number, the payment figure and the destination account number, how many possible payment messages to a specified correspondent bank will have the same MAC? If the payment clerk is able to run dummy messages through his system to check that a MAC is created, how many messages would he try before he is likely to find two with the same MAC for a specified destination bank?
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