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Cryptography and Network Security 7th Edition
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Cryptography and Network Security 7th Edition

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Questions and Answers

Who is the author of the book 'Cryptography and Network Security: Principles and Practice'?

William Stallings

Which edition of the book 'Cryptography and Network Security' is mentioned in the content?

  • Eighth Edition
  • Sixth Edition
  • Fifth Edition
  • Seventh Edition (correct)

    • The book 'Cryptography and Network Security: Principles and Practice' is a global edition.

    True

    What is the purpose of a firewall in network security?

    <p>To control access and enforce security policies</p> Signup and view all the answers

    Symmetric ciphers use the same key for both encryption and decryption.

    <p>True</p> Signup and view all the answers

    ____ Arithmetic is the basis for many encryption algorithms.

    <p>Finite</p> Signup and view all the answers

    Match the following encryption algorithm with its description:

    <p>RSA = Public-key cryptography system AES = Advanced Encryption Standard with finite field arithmetic DES = Data Encryption Standard using traditional block cipher structure</p> Signup and view all the answers

    What is provided to instructors at the Instructor Resource Center for this textbook?

    <p>several sample syllabuses</p> Signup and view all the answers

    What are the components of the projects and other student exercises available for cryptography or network security courses?

    <p>Firewall projects</p> Signup and view all the answers

    Using Sage in cryptographic examples and homework assignments involves licensing agreements and fees.

    <p>False</p> Signup and view all the answers

    Why is Sage considered a powerful and flexible tool for students?

    <p>can be used for virtually any mathematical application</p> Signup and view all the answers

    What are the changes mentioned in the preface that were made in the seventh edition of the book?

    <p>The changes mentioned in the preface include additions and revisions such as new sections on security design principles, attack surfaces and attack trees, consolidation of number theory into a single chapter, revised chapter on finite fields, addition of format-preserving encryption section, inclusion of conditioning and health testing for true random number generators, user authentication model, updated cloud security content, reorganization and update of Transport Layer Security (TLS) coverage, and a complete rewrite of Chapter 19 on email security.</p> Signup and view all the answers

    According to the preface, what is the purpose of the book?

    <p>To provide a practical survey of both principles and practice of cryptography and network security</p> Signup and view all the answers

    In CS2013, Information Assurance and Security (IAS) is included in the curriculum recommendation as part of the __________ Area.

    <p>Knowledge</p> Signup and view all the answers

    What are the key security requirements described in computer security?

    <p>confidentiality, integrity, and availability</p> Signup and view all the answers

    Which of the following is an example of a security attack?

    <p>Passive Attacks</p> Signup and view all the answers

    Data integrity ensures that information and programs are changed only in an unauthorized manner.

    <p>False</p> Signup and view all the answers

    ______ is the property of being genuine and being able to be verified and trusted.

    <p>Authenticity</p> Signup and view all the answers

    Match the following security concepts with their descriptions:

    <p>Confidentiality = Preserving authorized restrictions on information access and disclosure Integrity = Guarding against improper information modification or destruction Availability = Ensuring timely and reliable access to and use of information</p> Signup and view all the answers

    What does encapsulation provide in terms of isolation?

    <p>Protection by encapsulating procedures and data objects in a separate domain.</p> Signup and view all the answers

    Which design goal is achieved by developing common security modules?

    <p>Enhancing modularity in system design</p> Signup and view all the answers

    What is the impact of a limited adverse effect according to the security policy document?

    <p>Noticeably reduced organizational functions</p> Signup and view all the answers

    What is the security rating of student enrollment information based on confidentiality?

    <p>moderate</p> Signup and view all the answers

    In computer and network security, successful security mechanisms are usually easy to understand by the novice.

    <p>False</p> Signup and view all the answers

    Computer and network security is essentially a battle of wits between a perpetrator who tries to find holes and the designer or administrator who tries to ____________ them.

    <p>close</p> Signup and view all the answers

    Match the following terms with their definitions:

    <p>Security attack = Any action that compromises the security of information owned by an organization Security mechanism = A process designed to detect, prevent, or recover from a security attack Security service = A processing or communication service that enhances the security of data processing systems</p> Signup and view all the answers

    What is the purpose of nonrepudiation in communication?

    <p>Prevents either sender or receiver from denying a transmitted message</p> Signup and view all the answers

    What does access control achieve in network security?

    <p>Access control limits and controls the access to host systems and applications via communication links.</p> Signup and view all the answers

    Confidentiality protects data from active attacks.

    <p>False</p> Signup and view all the answers

    _______ ensures that messages are received as sent with no duplication, insertion, modification, reordering, or replays.

    <p>Data Integrity</p> Signup and view all the answers

    Match the security mechanism with its description:

    <p>Digital Signature = Allows proving the source and integrity of a data unit Authentication Exchange = Ensures the identity of an entity by means of information exchange Traffic Padding = Inserts bits into gaps in a data stream to frustrate traffic analysis attempts Access Control = Enforces access rights to resources</p> Signup and view all the answers

    Define threat in terms of security.

    <p>A potential for violation of security, existing when there is a circumstance, capability, action, or event that could breach security and cause harm.</p> Signup and view all the answers

    Explain what an attack is in the context of system security.

    <p>An assault on system security that derives from an intelligent threat, being a deliberate attempt to evade security services and violate the security policy of a system.</p> Signup and view all the answers

    What is the goal of passive attacks?

    <p>To obtain information from the system without affecting resources</p> Signup and view all the answers

    Masquerade is an example of an active attack.

    <p>True</p> Signup and view all the answers

    ____ involves the protection of data from unauthorized disclosure.

    <p>Connection Confidentiality</p> Signup and view all the answers

    Match the following security services with their descriptions:

    <p>Authentication = Assuring that a communication is authentic Data Integrity = Assurance that data received are exactly as sent by an authorized entity Access Control = Controls who can have access to a resource Connection Confidentiality = Protects all user data on a connection</p> Signup and view all the answers

    What does 'Least privilege' design principle entail?

    <p>Every process and every user of the system should operate using the least set of privileges necessary to perform the task.</p> Signup and view all the answers

    What does 'Fail-safe defaults' design principle suggest?

    <p>access decisions should be based on permission rather than exclusion</p> Signup and view all the answers

    Is 'Open design' a fundamental security design principle?

    <p>True</p> Signup and view all the answers

    Study Notes

    Preface to the 7th Edition of Cryptography and Network Security

    Changes in the 7th Edition

    • The book has been extensively reviewed by professors and professionals in the field to capture changes and improvements in the field.
    • The narrative has been clarified, tightened, and illustrations have been improved throughout the book.
    • Changes have been made to improve pedagogy and user-friendliness.

    Key Additions and Revisions

    • Fundamental Security Design Principles: A new section has been added to Chapter 1 discussing the security design principles listed by the National Centers of Academic Excellence in Information Assurance/Cyber Defense.
    • Attack Surfaces and Attack Trees: A new section has been added to Chapter 1 describing these two concepts, which are useful in evaluating and classifying security threats.
    • Number Theory Coverage: The material on number theory has been consolidated into a single chapter, Chapter 2, making it a convenient reference.
    • Finite Fields: The chapter on finite fields has been revised and expanded with additional text and new figures to enhance understanding.

    Let me know if you want me to add anything else!### Book Overview

    • The book covers both principles and practice of cryptography and network security
    • It is divided into 8 parts: Background, Symmetric Ciphers, Asymmetric Ciphers, Cryptographic Data Integrity Algorithms, Mutual Trust, Network and Internet Security, System Security, and Legal and Ethical Issues

    Objectives

    • The book aims to provide a practical survey of cryptography and network security
    • It covers both the principles and practice of cryptography and network security

    Edition Updates

    • The book has been updated to include new sections on format-preserving encryption, conditioning and health testing for true random number generators, user authentication model, cloud security, and transport layer security (TLS)
    • The book also covers email security, including discussion of email threats, STARTTLS, S/MIME, DNSSEC, and DANE

    ACM/IEEE Computer Science Curricula 2013

    • The book is intended to support the ACM/IEEE Computer Science Curricula 2013 (CS2013)
    • CS2013 adds Information Assurance and Security (IAS) to the curriculum recommendation as one of the Knowledge Areas in the Computer Science Body of Knowledge
    • The book covers virtually all of the topics listed by CS2013 in the IAS area

    Supporting Materials

    • The book comes with a range of supporting materials, including a solutions manual, projects manual, PowerPoint slides, PDF files, test bank, and sample syllabuses
    • These materials are available at the Instructor Resource Center (IRC) for this textbook

    Projects and Exercises

    • The book includes a range of projects and exercises to help students gain hands-on experience with cryptographic algorithms and network security
    • These projects include Sage projects, hacking projects, block cipher projects, lab exercises, research projects, programming projects, practical security assessments, firewall projects, case studies, writing assignments, and reading/report assignments

    Sage Computer Algebra System

    • The book makes use of Sage, a free, open-source computer algebra system, for cryptographic examples and homework assignments
    • Sage is a powerful tool that can be used for a wide range of mathematical applications, not just cryptography

    Online Documents for Students

    • The book comes with a range of online supporting materials, including online chapters, online appendices, homework problems and solutions, key papers, and supporting documents
    • These materials are available at the Companion Website, which is accessible with a code found in the book### Cryptographic Algorithms and Protocols
    • Can be grouped into four main areas:
      • Symmetric encryption: used to conceal large amounts of data, including messages, files, and passwords
      • Asymmetric encryption: used to conceal small amounts of data, such as encryption keys and hash function values
      • Data integrity algorithms: used to protect data from alteration
      • Authentication protocols: schemes designed to authenticate the identity of entities

    Network and Internet Security

    • Measures to deter, prevent, detect, and correct security violations involving the transmission of information
    • Examples of security violations:
      • Unauthorized access to sensitive information
      • Interception and alteration of messages
      • Construction of fake messages

    Computer Security Concepts

    • Definition: the protection of an automated information system to attain the objectives of preserving confidentiality, integrity, and availability of information system resources
    • Confidentiality: assures that private or confidential information is not made available to unauthorized individuals
      • Includes data confidentiality and privacy
    • Integrity: assures that information is changed only in a specified and authorized manner
      • Includes data integrity and system integrity
    • Availability: assures that systems work promptly and service is not denied to authorized users
    • The CIA triad: confidentiality, integrity, and availability form the fundamental security objectives for both data and information and computing services

    Additional Security Concepts

    • Authenticity: the property of being genuine and verifiable
    • Accountability: the requirement for actions to be traced uniquely to an entity
      • Supports nonrepudiation, deterrence, fault isolation, and after-action recovery

    Security Objectives

    • FIPS 199 categorizes security objectives into three levels of impact:
      • Low: limited adverse effect on organizational operations, assets, or individuals
      • Moderate: serious adverse effect on organizational operations, assets, or individuals
      • High: severe or catastrophic adverse effect on organizational operations, assets, or individuals

    Examples of Security Applications

    • Confidentiality:
      • Student grade information: high confidentiality rating
      • Student enrollment information: moderate confidentiality rating
      • Directory information: low confidentiality rating
    • Integrity:
      • Hospital patient's allergy information: high integrity requirement
      • Web site forum: moderate integrity requirement
      • Anonymous online poll: low integrity requirement
    • Availability:
      • Authentication services: high availability requirement
      • Public Web site: moderate availability requirement
      • Online telephone directory: low availability requirement

    Challenges of Computer Security

    • Complexity: security mechanisms can be complex and require subtle reasoning
    • Potential attacks: security mechanisms must be designed to withstand potential attacks
    • Counterintuitive procedures: security mechanisms may require counterintuitive procedures
    • Placement: security mechanisms must be placed at the right points in a network
    • Secret information: security mechanisms require the creation, distribution, and protection of secret information
    • Battle of wits: computer security is a battle between the attacker and the designer/administrator
    • Limited resources: security is often an afterthought and may not receive adequate resources

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    Description

    This quiz is based on the 7th edition of the book 'Cryptography and Network Security' by William Stallings, covering principles and practices of cryptography and network security.

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