Question 1

Which of the following is true about Message Authentication Code.

Accepted Answer

A)   it uses asymmetric encryption
B)   the key is sent to the receiver securely
C)   is uses PKI and certificates
D)   it uses a private and public keyE) B) and C)
F) B) and D)

Question 2

MATCHING
-the study of breaking encryption methods

Accepted Answer

A)  AES
B)  block cipher
C)  ciphertext
D)  cryptanalysis
E)  DESF) XOR functionG) IPsecH) key managementI) plaintextJ) stream cipherK) D) and J)
L) D) and G)

Question 3

What three conditions must be true to make a hashing algorithm secure?

Accepted Answer

1.No hash should be usable to determine ...

Question 4

The standardization of cryptographic protocols discourages attackers from trying to break them.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following was developed as a way of enabling Web servers and browsers to exchange encrypted information and uses a hashed message authentication code to increase security?

Accepted Answer

A)   SSH
B)   SSL
C)   TLS
D)   IPsecE) A) and C)
F) A) and D)

Question 6

Which of the following is commonly used for verifying message integrity?

Accepted Answer

A)   registration authority
B)   CRL
C)   pseudorandom number generator
D)   hashing functionE) B) and C)
F) A) and D)

Question 7

Which of the following is the first step in the digital signature process where Mike sends a message to Sophie?

Accepted Answer

A)   a message digest of Mike's message is calculated using a hashing algorithm
B)   Sophie compares the message digest she calculated to Mikes's message
C)   Sophie encrypts Mike's message with Mike's public key
D)   the message digest is encrypted by Mike's private keyE) B) and C)
F) All of the above A

Question 8

What is a hash value and how does it verify message integrity?

Accepted Answer

A hash value is a fixed-size string representing the original input's contents.If the input changes in any way,even by adding a period at the end of a sentence,the resulting output
has a different hash value.

Question 9

Which component of IPsec enables computers to exchange keys to make an SA?

Accepted Answer

A)   IKE
B)   ISAKMP
C)   Oakley
D)   IPsec driverE) B) and D)
F) B) and C)

Question 10

Which of the following is NOT a critical goal of information security?

Accepted Answer

A)   confidentiality
B)   scalability
C)   authentication
D)   nonrepudiationE) B) and C)
F) A) and C)

Question 11

Which of the following is described as a 64-bit block cipher composed of a 16-round Feistel network and key-dependent S-box functions?

Accepted Answer

A)   Twofish
B)   RC4
C)   Blowfish
D)   RijndaelE) All of the above
F) C) and D)

Question 12

In a passive attack,cryptanalysts eavesdrop on transmissions but don't interact with parties exchanging information.

Accepted Answer

A) True 
 B)False

Question 13

______________ cryptanalysis is applicable to block ciphers that use a substitution-permutation network including Rijndael,Twofish,and IDEA.

Accepted Answer

The answer of ______________ cryptanalysis is applicable to block ciphers...

Question 14

Which of the following is true about PRNGs?

Accepted Answer

A)   they are not completely random
B)   their state is measured in bytes
C)   the shorter the state, the longer the period
D)   they can never produce the same valueE) None of the above
F) A) and B)

Question 15

MATCHING
-a type of encryption algorithm that encrypts groups of cleartext characters

Accepted Answer

A)  AES
B)  block cipher
C)  ciphertext
D)  cryptanalysis
E)  DESF) XOR functionG) IPsecH) key managementI) plaintextJ) stream cipherK) B) and E)
L) C) and H)

Question 16

MATCHING
-A set of standard procedures that the Internet Engineering Task Force (IETF) developed for enabling secure communication on the Internet

Accepted Answer

A)  AES
B)  block cipher
C)  ciphertext
D)  cryptanalysis
E)  DESF) XOR functionG) IPsecH) key managementI) plaintextJ) stream cipherK) H) and I)
L) B) and F)

Question 17

Compare and contrast block cipher with stream cipher.

Accepted Answer

The two major types of encryption algori...

Question 18

Which of the following best describes a CRL?

Accepted Answer

A)   a published listing of invalid certificates
B)   serve as a front end to users for revoking certificates
C)   a file that contains information about the user and public key
D)   keeps track of issued credentials and manages revocation of certificatesE) A) and B)
F) A) and D)

Question 19

Which of the following makes a single pass on data and generates a 128-bit hash value displayed as a 32-character hexadecimal number and is used in VPNs?

Accepted Answer

A)   RSA
B)   Message Digest 5
C)   RC4
D)   TwofishE) B) and D)
F) B) and C)

Question 20

Encrypted files can be transmitted in both electronic form and as written messages.

Accepted Answer

A) True 
 B)False  True

Exam 5: Cryptography

Which of the following is true about Message Authentication Code.

Correct AnswerverifiedShow Answer

MATCHING -the study of breaking encryption methods

Correct AnswerverifiedShow Answer

What three conditions must be true to make a hashing algorithm secure?

Correct Answerverified1.No hash should be usable to determine ...View AnswerShow Answer

The standardization of cryptographic protocols discourages attackers from trying to break them.

Correct AnswerverifiedShow Answer

Which of the following was developed as a way of enabling Web servers and browsers to exchange encrypted information and uses a hashed message authentication code to increase security?

Correct AnswerverifiedShow Answer

Which of the following is commonly used for verifying message integrity?

Correct AnswerverifiedShow Answer

Which of the following is the first step in the digital signature process where Mike sends a message to Sophie?

Correct AnswerverifiedA

What is a hash value and how does it verify message integrity?

Correct AnswerverifiedA hash value is a fixed-size string representing the original input's contents.If the input changes in any way,even by adding a period at the end of a sentence,the resulting output has a different hash value.

Which component of IPsec enables computers to exchange keys to make an SA?

Correct AnswerverifiedShow Answer

Which of the following is NOT a critical goal of information security?

Correct AnswerverifiedShow Answer

Which of the following is described as a 64-bit block cipher composed of a 16-round Feistel network and key-dependent S-box functions?

Correct AnswerverifiedShow Answer

In a passive attack,cryptanalysts eavesdrop on transmissions but don't interact with parties exchanging information.

Correct AnswerverifiedShow Answer

______________ cryptanalysis is applicable to block ciphers that use a substitution-permutation network including Rijndael,Twofish,and IDEA.

Correct AnswerverifiedShow Answer

Which of the following is true about PRNGs?

Correct AnswerverifiedShow Answer

MATCHING -a type of encryption algorithm that encrypts groups of cleartext characters

Correct AnswerverifiedShow Answer

MATCHING -A set of standard procedures that the Internet Engineering Task Force (IETF) developed for enabling secure communication on the Internet

Correct AnswerverifiedShow Answer

Compare and contrast block cipher with stream cipher.

Correct AnswerverifiedThe two major types of encryption algori...View AnswerShow Answer

Which of the following best describes a CRL?

Correct AnswerverifiedShow Answer

Which of the following makes a single pass on data and generates a 128-bit hash value displayed as a 32-character hexadecimal number and is used in VPNs?

Correct AnswerverifiedShow Answer

Encrypted files can be transmitted in both electronic form and as written messages.

Correct AnswerverifiedTrue

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1.No hash should be usable to determine ...
View Answer

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A

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A hash value is a fixed-size string representing the original input's contents.If the input changes in any way,even by adding a period at the end of a sentence,the resulting output has a different hash value.

Correct Answer
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The two major types of encryption algori...
View Answer

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True