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 hank?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Question 16: 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:Question 16: 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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