Question 1

An important element in many computer security services and
applications is the use of cryptographic algorithms.

Accepted Answer

A) True 
 B)False  True

Question 2

Public-key encryption was first publicly proposed by __________ in 1976.

Accepted Answer

Diffie and Hellman

Question 3

__________ is a procedure that allows communicating parties to verify that received or stored messages are authentic.

Accepted Answer

A) Cryptanalysis 
B) Decryption 
C) Message authentication 
D) Collision resistance 
A) Cryptanalysis 
B) Decryption 
C) Message authentication 
D) Collision resistance C

Question 4

Like the MAC,a hash function also takes a secret key as input.

Accepted Answer

A) True 
 B)False

Question 5

The __________ is a pair of keys that have been selected so that if one is used for encryption,the other is used for decryption.

Accepted Answer

public and

Question 6

Some form of protocol is needed for public-key distribution.

Accepted Answer

A) True 
 B)False

Question 7

Public-key cryptography is asymmetric.

Accepted Answer

A) True 
 B)False

Question 8

On average,__________ of all possible keys must be tried in order to achieve success with a brute-force attack.

Accepted Answer

A) one-fourth 
B) half 
C) two-thirds 
D) three-fourths 
A) one-fourth 
B) half 
C) two-thirds 
D) three-fourths

Question 9

A _________ protects against an attack in which one party generates a message for another party to sign.

Accepted Answer

A) data authenticator 
B) strong hash function 
C) weak hash function 
D) digital signature 
A) data authenticator 
B) strong hash function 
C) weak hash function 
D) digital signature

Question 10

Symmetric encryption is used primarily to provide confidentiality.

Accepted Answer

A) True 
 B)False

Question 11

A __________ processes the plaintext input in fixed-size blocks and produces a block of ciphertext of equal size for each plaintext block.

Accepted Answer

The answer of A __________ processes the plaintext input in...

Question 12

The purpose of the __________ algorithm is to enable two users to securely reach agreement about a shared secret that can be used as a secret key for subsequent symmetric encryption of messages.

Accepted Answer

Diffie-Hel

Question 13

A _________ is a hardware device that sits between servers and storage systems and encrypts all data going from the server to the storage system and decrypts data going in the opposite direction.

Accepted Answer

The answer of A _________ is a hardware device that...

Question 14

The original message or data that is fed into the algorithm is __________.

Accepted Answer

A) encryption algorithm 
B) secret key 
C) decryption algorithm 
D) plaintext 
A) encryption algorithm 
B) secret key 
C) decryption algorithm 
D) plaintext

Question 15

A __________ is to try every possible key on a piece of ciphertext until an intelligible translation into plaintext is obtained.

Accepted Answer

A) mode of operation 
B) hash function 
C) cryptanalysis 
D) brute-force attack 
A) mode of operation 
B) hash function 
C) cryptanalysis 
D) brute-force attack

Question 16

Also referred to as single-key encryption,the universal technique for providing confidentiality for transmitted or stored data is __________ .

Accepted Answer

symmetric

Question 17

__________ is a block cipher in which the plaintext and ciphertext are integers between 0 and n-1 for some n.

Accepted Answer

A) DSS 
B) RSA 
C) AES 
D) SHA 
A) DSS 
B) RSA 
C) AES 
D) SHA

Question 18

The purpose of the DSS algorithm is to enable two users to securely
reach agreement about a shared secret that can be used as a secret key
for subsequent symmetric encryption of messages.

Accepted Answer

A) True 
 B)False

Question 19

Combined one byte at a time with the plaintext stream using the XOR operation,a __________ is the output of the pseudorandom bit generator.

Accepted Answer

A) keystream 
B) digital signature 
C) secure hash 
D) message authentication code 
A) keystream 
B) digital signature 
C) secure hash 
D) message authentication code

Question 20

The most important symmetric algorithms,all of which are block ciphers,are the DES,triple DES,and the __________.

Accepted Answer

A) SHA 
B) RSA 
C) AES 
D) DSS 
A) SHA 
B) RSA 
C) AES 
D) DSS

Exam 2: Cryptographic Tools

An important element in many computer security services and applications is the use of cryptographic algorithms.

Public-key encryption was first publicly proposed by __________ in 1976.

__________ is a procedure that allows communicating parties to verify that received or stored messages are authentic.

Like the MAC,a hash function also takes a secret key as input.

The __________ is a pair of keys that have been selected so that if one is used for encryption,the other is used for decryption.

Some form of protocol is needed for public-key distribution.

Public-key cryptography is asymmetric.

On average,__________ of all possible keys must be tried in order to achieve success with a brute-force attack.

A _________ protects against an attack in which one party generates a message for another party to sign.

Symmetric encryption is used primarily to provide confidentiality.

A __________ processes the plaintext input in fixed-size blocks and produces a block of ciphertext of equal size for each plaintext block.

The purpose of the __________ algorithm is to enable two users to securely reach agreement about a shared secret that can be used as a secret key for subsequent symmetric encryption of messages.

A _________ is a hardware device that sits between servers and storage systems and encrypts all data going from the server to the storage system and decrypts data going in the opposite direction.

The original message or data that is fed into the algorithm is __________.

A __________ is to try every possible key on a piece of ciphertext until an intelligible translation into plaintext is obtained.

Also referred to as single-key encryption,the universal technique for providing confidentiality for transmitted or stored data is __________ .

__________ is a block cipher in which the plaintext and ciphertext are integers between 0 and n-1 for some n.

The purpose of the DSS algorithm is to enable two users to securely reach agreement about a shared secret that can be used as a secret key for subsequent symmetric encryption of messages.

Combined one byte at a time with the plaintext stream using the XOR operation,a __________ is the output of the pseudorandom bit generator.

The most important symmetric algorithms,all of which are block ciphers,are the DES,triple DES,and the __________.

Computer Systems Overview

User Authentication

Access Control

Database Security

Malicious Software

Denial-Of-Service Attacks

Intrusion Detection

Firewalls and Intrusion Prevention Systems

Buffer Overflow

Software Security

Operating System Security

Trusted Computing and Multilevel Security

It Security Management and Risk Assessment

It Security Controls, plans, and Procedures

Physical and Infrastructure Security

Human Resources Security

Security Auditing

Legal and Ethical Aspects

Symmetric Encryption and Message Confidentiality

Public-Key Cryptography and Message Authentication

Internet Security Protocols and Standards

Internet Authentication Applications

Wireless Network Security

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