Test Bank For Network Security Essentials Applications and Standards 5th Edition By Willaim Stallings

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Key Topics Covered

• Cryptographic Techniques: Topics that will be discussed in this section include encryption, decryption, and cryptography techniques which assist in the protection of information.
• Network Security Protocols: A comprehensive guide to recognized protocols like SSL / TLS, and IPsec and how they can be utilized in the facilitation of data security during sharing.
• Firewalls and Intrusion Detection Systems: Investigation of firewall features and their role to run a remit that prohibits access without permission as well as weaponry detection.
• Authentication and Access Control: Examination of possible means of individuals’ verification and the eventual access control to resources.
• Security Management and Policies: Provide ideas on how strategic security measures and practices can be applied toward constructing and executing relevant policies.

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Test Bank For Network Security Essentials Applications and Standards 5th Edition By Willaim Stallings

Chapter 2:  Symmetric Encryption and Message Confidentiality

TRUE OR FALSE

T F 1.  Public-key encryption is also referred to as conventional 

      encryption, secret-key, or single-key encryption.

T F 2.  The advantage of a block cipher is that you can reuse keys.

T F 3.  Ciphertext is the scrambled message produced as output.

T F 4.  The security of symmetric encryption depends on the secrecy of 

      the algorithm, not the secrecy of the key.

T F 5.  The ciphertext-only attack is the easiest to defend against because 

      the opponent has the least amount of information to work with. 

T F 6.  The Feistel structure is a particular example of the more general 

      structure used by all symmetric block ciphers.

T F 7.  Smaller block sizes mean greater security but reduced 

      encryption/decryption speed.

T F 8.  The essence of a symmetric block cipher is that a single-round 

      offers inadequate security but multiple rounds offer 

      increasing security.

T F 9.  Triple DES was first standardized for use in financial applications 

      in ANSI standard X9.17 in 1985.

T F 10.  The most commonly used symmetric encryption algorithms are 

         stream ciphers.

T F 11.  The principal drawback of 3DES is that the algorithm is relatively 

         sluggish in software.

T F 12.  AES uses a Feistel structure.

T F 13. Random numbers play an important role in the use of encryption 

        for various network security applications.

T F 14.  The primary advantage of a stream cipher is that stream ciphers 

         are almost always faster and use far less code than do block 

         ciphers.

T F 15.  One desirable property of a stream cipher is that the ciphertext be 

        longer in length than the plaintext.

MULTIPLE CHOICE

1. A symmetric encryption scheme has _________ ingredients.

A.  three B.  six

C.  five D.  four

1. _________ is the original message or data that is fed into the algorithm as input.

A.  DES B.  Plaintext

C.  Encryption key D.  Ciphertext

1. _________ mode requires only the implementation of the encryption algorithm and not the decryption algorithm.

A.  CBC B.  DKS

C.  ECB D.  CTR

1. A __________ processes the input elements continuously, producing output one element at a time, as it goes along.

A.  block cipher.  cryptanalysis

C.  keystreamD.  stream cipher 

1. If both sender and receiver use the same key the system is referred to as _________ encryption.

A. asymmetric.  two-key

C. symmetric.  public-key 

1. If the sender and receiver each use a different key the system is referred to as __________ encryption.

A.  secret-keyB.  conventional

C.  single-keyD.  asymmetric