Question 1

What is the difference between a public key and a private key?

Accepted Answer

A public key is openly available;in many cases,public keys can be downloaded from Web sites for the public to use.A private key is the secret key known only by the key owner and should never be shared.

Question 2

What is a digital signature?

Accepted Answer

Asymmetric algorithms have a useful feature that enables a public key to decrypt a message that was encrypted using a private key,or vice versa.The only way a public key can decrypt a message that has been encrypted with a private key is when that message was encrypted by the corresponding private key's holder.This type of encryption is called a digital signature.

Question 3

____ is the original password-cracking program now used by many government agencies to test for password strength.

Accepted Answer

A) John the Ripper 
B) Hydra (TH
C)  
C) Pwdump3v2 
D) L0phtcrack 
A) John the Ripper 
B) Hydra (TH
C)  
C) Pwdump3v2 
D) L0phtcrack D

Question 4

____, developed by Xuejia Lai and James Massey, is a block cipher that operates on 64-bit blocks of plaintext.

Accepted Answer

A) Advanced Encryption Standard (AES) 
B) RC5 
C) International Data Encryption Algorithm (IDE
A)  
D) Blowfish 
A) Advanced Encryption Standard (AES) 
B) RC5 
C) International Data Encryption Algorithm (IDE
A)  
D) Blowfish

Question 5

Another name for asymmetric algorithms is ____________________ key cryptography, and these terms are often used interchangeably.

Accepted Answer

The answer of Another name for asymmetric algorithms is ____________________...

Question 6

Symmetric algorithms use two keys that are mathematically related.

Accepted Answer

A) True 
 B)False

Question 7

What is 3DES?

Accepted Answer

Triple Data Encryption Standard (3DES)se

Question 8

____ was developed by Phil Zimmerman as a free e-mail encryption program that allowed typical users to encrypt e-mail messages.

Accepted Answer

A) PKI 
B) PEM 
C) PGP 
D) S/MIME 
A) PKI 
B) PEM 
C) PGP 
D) S/MIME

Question 9

MATCHING
Match each term with the correct statement below.
-uses a single key to encrypt and decrypt data

Accepted Answer

A) asymmetric encryption 
B) collision free 
C) symmetric encryption 
D) certificate 
E) hashing
F)collision
G)stream cipher
H)message digest
I)block cipher 
A) asymmetric encryption 
B) collision free 
C) symmetric encryption 
D) certificate 
E) hashing
F)collision
G)stream cipher
H)message digest
I)block cipher

Question 10

In a(n) ____________________ attack, the attacker captures data and attempts to resubmit the captured data so that the device, which can be a computer or router, thinks a legitimate connection is in effect.

Accepted Answer

The answer of In a(n) ____________________ attack, the attacker captures...

Question 11

____ means that a user can't deny he or she sent a message to a recipient, and the receiver of a message can't deny ever receiving the message.

Accepted Answer

A) Authentication 
B) Nonrepudiation 
C) Availability 
D) Integrity 
A) Authentication 
B) Nonrepudiation 
C) Availability 
D) Integrity

Question 12

MD5 is a variation of the SHA-1 hashing algorithm that processes blocks twice the size of SHA-1.

Accepted Answer

A) True 
 B)False

Question 13

____ is used for encryption as well as digital signatures and key exchange.

Accepted Answer

A) Diffie-Hellman 
B) ECC 
C) Blowfish 
D) AES 
A) Diffie-Hellman 
B) ECC 
C) Blowfish 
D) AES

Question 14

MATCHING
Match each term with the correct statement below.
-uses two keys, one to encrypt and one to decrypt data

Accepted Answer

A) asymmetric encryption 
B) collision free 
C) symmetric encryption 
D) certificate 
E) hashing
F)collision
G)stream cipher
H)message digest
I)block cipher 
A) asymmetric encryption 
B) collision free 
C) symmetric encryption 
D) certificate 
E) hashing
F)collision
G)stream cipher
H)message digest
I)block cipher

Question 15

The ____ algorithm does not provide encryption but is used to establish the secret key between two parties.

Accepted Answer

A) Elgamal 
B) Blowfish 
C) Diffie-Hellman 
D) RSA 
A) Elgamal 
B) Blowfish 
C) Diffie-Hellman 
D) RSA

Question 16

In a ____ attack, the attacker has the ciphertext of several messages that were encrypted with the same encryption algorithm but has no access to the plaintext, so he or she must try to figure out the key used to encrypt the data.

Accepted Answer

A) chosen-ciphertext 
B) chosen-plaintext 
C) known plaintext 
D) ciphertext-only 
A) chosen-ciphertext 
B) chosen-plaintext 
C) known plaintext 
D) ciphertext-only

Question 17

A famous encryption device was the ____ machine developed by Arthur Scherbius and used by the Germans during World War II.

Accepted Answer

A) Purple 
B) Enigma 
C) Caesar 
D) Vigenere 
A) Purple 
B) Enigma 
C) Caesar 
D) Vigenere

Question 18

In a ____ attack, an attacker uses a password-cracking program to guess passwords by attempting every possible combination of letters.

Accepted Answer

A) brute force 
B) replay 
C) ciphertext-only 
D) dictionary 
A) brute force 
B) replay 
C) ciphertext-only 
D) dictionary

Question 19

AES uses a 128-bit key and is used in PGP encryption software.

Accepted Answer

A) True 
 B)False

Question 20

____ refers to verifying the sender or receiver (or both) is who he or she claims to be.

Accepted Answer

A) Authentication 
B) Nonrepudiation 
C) Availability 
D) Authorization 
A) Authentication 
B) Nonrepudiation 
C) Availability 
D) Authorization

What is the difference between a public key and a private key?

What is a digital signature?

____ is the original password-cracking program now used by many government agencies to test for password strength.

____, developed by Xuejia Lai and James Massey, is a block cipher that operates on 64-bit blocks of plaintext.

Another name for asymmetric algorithms is ____________________ key cryptography, and these terms are often used interchangeably.

Symmetric algorithms use two keys that are mathematically related.

What is 3DES?

____ was developed by Phil Zimmerman as a free e-mail encryption program that allowed typical users to encrypt e-mail messages.

MATCHING Match each term with the correct statement below. -uses a single key to encrypt and decrypt data

In a(n) ____________________ attack, the attacker captures data and attempts to resubmit the captured data so that the device, which can be a computer or router, thinks a legitimate connection is in effect.

____ means that a user can't deny he or she sent a message to a recipient, and the receiver of a message can't deny ever receiving the message.

MD5 is a variation of the SHA-1 hashing algorithm that processes blocks twice the size of SHA-1.

____ is used for encryption as well as digital signatures and key exchange.

MATCHING Match each term with the correct statement below. -uses two keys, one to encrypt and one to decrypt data

The ____ algorithm does not provide encryption but is used to establish the secret key between two parties.

In a ____ attack, the attacker has the ciphertext of several messages that were encrypted with the same encryption algorithm but has no access to the plaintext, so he or she must try to figure out the key used to encrypt the data.

A famous encryption device was the ____ machine developed by Arthur Scherbius and used by the Germans during World War II.

In a ____ attack, an attacker uses a password-cracking program to guess passwords by attempting every possible combination of letters.

AES uses a 128-bit key and is used in PGP encryption software.

____ refers to verifying the sender or receiver (or both) is who he or she claims to be.

Ethical Hacking Overview

Tcpip Concepts Review

Network and Computer Attacks

Footprinting and Social Engineering

Port Scanning

Enumeration

Programming for Security Professionals

Desktop and Server Os Vulnerabilities

Embedded Operating Systems: The Hidden Threat

Hacking Web Servers

Hacking Wireless Networks

Network Protection Systems

Filters

Exam 12: Cryptography

What is the difference between a public key and a private key?

What is a digital signature?

____ is the original password-cracking program now used by many government agencies to test for password strength.

____, developed by Xuejia Lai and James Massey, is a block cipher that operates on 64-bit blocks of plaintext.

Another name for asymmetric algorithms is ____________________ key cryptography, and these terms are often used interchangeably.

Symmetric algorithms use two keys that are mathematically related.

What is 3DES?

____ was developed by Phil Zimmerman as a free e-mail encryption program that allowed typical users to encrypt e-mail messages.

MATCHING Match each term with the correct statement below. -uses a single key to encrypt and decrypt data

In a(n) ____________________ attack, the attacker captures data and attempts to resubmit the captured data so that the device, which can be a computer or router, thinks a legitimate connection is in effect.

____ means that a user can't deny he or she sent a message to a recipient, and the receiver of a message can't deny ever receiving the message.

MD5 is a variation of the SHA-1 hashing algorithm that processes blocks twice the size of SHA-1.

____ is used for encryption as well as digital signatures and key exchange.

MATCHING Match each term with the correct statement below. -uses two keys, one to encrypt and one to decrypt data

The ____ algorithm does not provide encryption but is used to establish the secret key between two parties.

In a ____ attack, the attacker has the ciphertext of several messages that were encrypted with the same encryption algorithm but has no access to the plaintext, so he or she must try to figure out the key used to encrypt the data.

A famous encryption device was the ____ machine developed by Arthur Scherbius and used by the Germans during World War II.

In a ____ attack, an attacker uses a password-cracking program to guess passwords by attempting every possible combination of letters.

AES uses a 128-bit key and is used in PGP encryption software.

____ refers to verifying the sender or receiver (or both) is who he or she claims to be.

Ethical Hacking Overview

Tcpip Concepts Review

Network and Computer Attacks

Footprinting and Social Engineering

Port Scanning

Enumeration

Programming for Security Professionals

Desktop and Server Os Vulnerabilities

Embedded Operating Systems: The Hidden Threat

Hacking Web Servers

Hacking Wireless Networks

Network Protection Systems

Filters