Question 1

The ciphertext-only attack is the easiest to defend against.

Accepted Answer

A) True 
 B)False  True

Question 2

With _________ encryption the encryption process is carried out at the two end systems.

Accepted Answer

end-to-end

Question 3

A ________ is a key used between entities for the purpose of distributing session keys.

Accepted Answer

A) permanent key 
B) session key 
C) distribution key 
D) all of the above 
A) permanent key 
B) session key 
C) distribution key 
D) all of the above A

Question 4

______ was designed in 1987 by Ron Rivest and is a variable key-size stream cipher with byte-oriented operations.

Accepted Answer

The answer of ______ was designed in 1987 by Ron...

Question 5

"The input to the encryption algorithm is the XOR of the next 64 bits of plaintext and the preceding 64 bits of ciphertext" is a description of the ________ mode of operation.

Accepted Answer

Cipher Blo

Question 6

Public-key encryption was developed in the late ________.

Accepted Answer

A) 1950s 
B) 1970s 
C) 1960s 
D) 1980s 
A) 1950s 
B) 1970s 
C) 1960s 
D) 1980s

Question 7

A ________ cipher processes the input one block of elements at a time,producing an output block for each input block.

Accepted Answer

The answer of A ________ cipher processes the input one...

Question 8

It is possible to convert any block cipher into a stream cipher by using
the cipher feedback (CFB)mode.

Accepted Answer

A) True 
 B)False

Question 9

"The plaintext is 64 bits in length and the key is 56 bits in length;
longer plaintext amounts are processed in 64-bit blocks" is a description of the DES algorithm.

Accepted Answer

A) True 
 B)False

Question 10

The _________ was issued as a federal information-processing standard and is intended to replace DES and 3DES with an algorithm that is more secure and efficient.

Accepted Answer

Advanced E

Question 11

For general-purpose block-oriented transmission you would typically use _______ mode.

Accepted Answer

A) CBC 
B) CTR 
C) CFB 
D) OFB 
A) CBC 
B) CTR 
C) CFB 
D) OFB

Question 12

The exact substitutions and transformations performed by the algorithm depend on the ________.

Accepted Answer

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

Question 13

Plaintext is the scrambled message produced as output.

Accepted Answer

A) True 
 B)False

Question 14

The _________ is the encryption algorithm run in reverse.

Accepted Answer

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

Question 15

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

Accepted Answer

The answer of A ________ cipher processes the input elements...

Question 16

In using encryption,we need to decide what to encrypt and where the
encryption gear should be located.

Accepted Answer

A) True 
 B)False

Question 17

The three most important symmetric block ciphers are: 3DES,AES,and _____.

Accepted Answer

Data Encry

Question 18

A brute-force approach involves trying every possible key until an
intelligible translation of the ciphertext into plaintext is obtained.

Accepted Answer

A) True 
 B)False

Question 19

Stream ciphers are far more common than block ciphers.

Accepted Answer

A) True 
 B)False

Question 20

The _______ module performs end-to-end encryption and obtains session keys on behalf of users.

Accepted Answer

A) PKM 
B) RCM 
C) SSM 
D) CCM 
A) PKM 
B) RCM 
C) SSM 
D) CCM

Exam 20: Symmetric Encryption and Message Confidentiality

The ciphertext-only attack is the easiest to defend against.

With _________ encryption the encryption process is carried out at the two end systems.

A ________ is a key used between entities for the purpose of distributing session keys.

______ was designed in 1987 by Ron Rivest and is a variable key-size stream cipher with byte-oriented operations.

"The input to the encryption algorithm is the XOR of the next 64 bits of plaintext and the preceding 64 bits of ciphertext" is a description of the ________ mode of operation.

Public-key encryption was developed in the late ________.

A ________ cipher processes the input one block of elements at a time,producing an output block for each input block.

It is possible to convert any block cipher into a stream cipher by using the cipher feedback (CFB)mode.

"The plaintext is 64 bits in length and the key is 56 bits in length; longer plaintext amounts are processed in 64-bit blocks" is a description of the DES algorithm.

The _________ was issued as a federal information-processing standard and is intended to replace DES and 3DES with an algorithm that is more secure and efficient.

For general-purpose block-oriented transmission you would typically use _______ mode.

The exact substitutions and transformations performed by the algorithm depend on the ________.

Plaintext is the scrambled message produced as output.

The _________ is the encryption algorithm run in reverse.

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

In using encryption,we need to decide what to encrypt and where the encryption gear should be located.

The three most important symmetric block ciphers are: 3DES,AES,and _____.

A brute-force approach involves trying every possible key until an intelligible translation of the ciphertext into plaintext is obtained.

Stream ciphers are far more common than block ciphers.

The _______ module performs end-to-end encryption and obtains session keys on behalf of users.

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