DATABASE SYSTEM CONCEPTS (LOOSELEAF)
DATABASE SYSTEM CONCEPTS (LOOSELEAF)
7th Edition
ISBN: 9781260515046
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 10, Problem 16E
Program Plan Intro

Publish-Subscribe System:

  • In the publish-subscribe system, an operation is persisted in a topic.
  • In contrast to point-to-point system, the consumers may subscribe to many topics and then consume all the messages in those topics.
  • The publishers are the message producers and subscribers are the message consumers.

Example:

A streaming service that publishes different channels such as movies, sports and music. People are able to subscribe to the set of channels that they want and get them whenever their subscribed channels are available.

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We are considering the RSA encryption scheme. The involved numbers are small, so the communication is insecure.  Alice's public key (n,public_key) is (247,7). A code breaker manages to factories  247 = 13 x 19  Determine Alice's secret key. To solve the problem, you need not use the extended Euclid algorithm, but you may assume that her private key is one of the following numbers 31,35,55,59,77,89.
Consider the following Turing Machine (TM). Does the TM halt if it begins on the empty tape? If it halts, after how many steps? Does the TM halt if it begins on a tape that contains a single letter A followed by blanks? Justify your answer.
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