Imagine you are the leader of an international gang of smugglers. One of your gang member (John) has a very expensive diamond that he wants to deliver it to you through a series of middlemen. Each middleman will charge some amount to deliver the diamond to the next middleman. You want to get the diamond at a minimum cost. So you decide to tell John how exactly to deliver the diamond to you as shown in the table below. Since you are an underworld boss who has studied Data Structures and Algorithms, you decide to solve how the diamond will be delivered to you by modeling the problem as a graph and then applying an algorithm to it. Tell me the following Create a graph for this problem. (1) What algorithm will apply on it? Where will you start it from? (1) ii. Redraw the graph and highlight (make bold) the solution, i.e. make the edges and vertices of the solution. (3) (Non-anonymous questionO) * L i. ii. Person 1 | Person 2 John John John Brad Tom Amount Charged $ 1000 $2000 $1500 $ 400 $ 800 $ 300 $600 Brad Micheal George Tom You You You Micheal George

Imagine you are the leader of an international gang of smugglers. One of your gang member (John) has a very expensive diamond that he wants to deliver it to you through a series of middlemen. Each middleman will charge some amount to deliver the diamond to the next middleman. You want to get the diamond at a minimum cost. So you decide to tell John how exactly to deliver the diamond to you as shown in the table below. Since you are an underworld boss who has studied Data Structures and Algorithms, you decide to solve how the diamond will be delivered to you by modeling the problem as a graph and then applying an algorithm to it. Tell me the following Create a graph for this problem. (1) What algorithm will apply on it? Where will you start it from? (1) ii. Redraw the graph and highlight (make bold) the solution, i.e. make the edges and vertices of the solution. (3) (Non-anonymous questionO) * L i. ii. Person 1 | Person 2 John John John Brad Tom Amount Charged $ 1000 $2000 $1500 $ 400 $ 800 $ 300 $600 Brad Micheal George Tom You You You Micheal George

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

Section: Chapter Questions

Problem 1PE

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Consider the long-term security of the Advanced Encryption Standard (AES) with a key length of 128-bit with respect to exhaustive key-search attacks. AES is perhaps the most widely used symmetric cipher at this time. a. Assume that an attacker has a special purpose application-specific integrated circuit (ASIC) which checks 5 · 108 keys per second, and she has a budget of $1 million. One ASIC costs $50, and we assume 100% overhead for integrating the ASIC (manufacturing the printed circuit boards, power supply, cooling, etc.). How many ASICs can we run in parallel with the given budget? b. Take into account advaancess in computer technology. Applying Moore's Law: Computer power doubles every T = 18 Months. While cost of ASIC's remain constant at $50 each. How many years do we have to wait until a key-search machine can be built for breaking AES with 128-bit with an average search time of 24 hours? Budget is still $1 million
Show your work. Explain what techniques you applied. Cite all tools and sources used. A correct answer without supporting work may not receive full credit. 1. Consider the encryption defined by the following table. Plaintext A B A B A B Let the plaintext probability distribution be P(A) P(k₂) = 1/2, P(ks) = 1/4. (a) Find the ciphertext probability distribution. Key Ciphertext D k₁ k₁ E k₂ F k₂ D k3 E k3 F 1/4, P(B) = 3/4 and the key distribution be P(k₁) = 1/4, (b) Find entropy of the plaintext variable, the key variable, and the ciphertext variable. (e) Find the key equivocation. (d) Find a different key distribution that will make the key equivocation less than 0.5. (e) Find a different key distribution that will make the key equivocation greater than you found in question le above.
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