Question 1

________ thwart replay attacks by ensuring "freshness" using cutoff values.

Accepted Answer

A)  Time stamps 
B)  Sequence numbers 
C)  Nonces 
D)  All of the above. 
A)  Time stamps 
B)  Sequence numbers 
C)  Nonces 
D)  All of the above.

Question 2

A ________ is a random string of 40 to 4,000 bits (ones and zeros) used to encrypt messages.

Accepted Answer

A)  key 
B)  cipher 
C)  plaintext 
D)  code 
A)  key 
B)  cipher 
C)  plaintext 
D)  code

Question 3

Which of the following statements accurately describes RC4?

Accepted Answer

A)  RC4 is very slow. 
B)  RC4 uses a large amount of RAM. 
C)  RC4 can use a broad range of key lengths. 
D)  All of the above 
A)  RC4 is very slow. 
B)  RC4 uses a large amount of RAM. 
C)  RC4 can use a broad range of key lengths. 
D)  All of the above

Question 4

The hash size in MD-5 is 160 bits.

Accepted Answer

A) True 
 B)False

Question 5

________ occurs when companies believe they have good security because they are using proprietary ciphers that hackers do not know.

Accepted Answer

A)  Security through obscurity 
B)  Weakest link ignorance 
C)  Reasonable protection 
D)  Hidden security 
A)  Security through obscurity 
B)  Weakest link ignorance 
C)  Reasonable protection 
D)  Hidden security

Question 6

Cryptanalysts have found weaknesses in ________.

Accepted Answer

A)  MD5 
B)  SHA-512 
C)  Both A and B 
D)  Neither A nor B 
A)  MD5 
B)  SHA-512 
C)  Both A and B 
D)  Neither A nor B

Question 7

To be strong, ________ keys need to be longer than ________ keys.

Accepted Answer

A)  public, symmetric 
B)  symmetric, public 
C)  Public and symmetric keys of about the same length have about equal strength. 
D)  None of the above 
A)  public, symmetric 
B)  symmetric, public 
C)  Public and symmetric keys of about the same length have about equal strength. 
D)  None of the above

Question 8

Which encryption method does MS-CHAP use?

Accepted Answer

A)  Symmetric key encryption 
B)  Public key encryption 
C)  Both A and B 
D)  Neither A nor B 
A)  Symmetric key encryption 
B)  Public key encryption 
C)  Both A and B 
D)  Neither A nor B

Question 9

The most popular public key cipher is RSA.

Accepted Answer

A) True 
 B)False

Question 10

IPsec operates at the ________ layer.

Accepted Answer

A)  data link 
B)  internet 
C)  transport 
D)  application 
A)  data link 
B)  internet 
C)  transport 
D)  application

Question 11

When Joshua sends a message to Larry, Joshua will use ________ to encrypt the message.

Accepted Answer

A)  the public key 
B)  Joshua's public key 
C)  Larry's public key 
D)  Larry's private key 
A)  the public key 
B)  Joshua's public key 
C)  Larry's public key 
D)  Larry's private key

Question 12

Digital signatures provide ________.

Accepted Answer

A)  message authentication 
B)  message integrity 
C)  Both A and B 
D)  Neither A nor B 
A)  message authentication 
B)  message integrity 
C)  Both A and B 
D)  Neither A nor B

Question 13

A DES key is ________ bits long.

Accepted Answer

A)  40 
B)  56 
C)  100 
D)  128 
A)  40 
B)  56 
C)  100 
D)  128

Question 14

A DES key is 40 bits long.

Accepted Answer

A) True 
 B)False

Question 15

SSL/TLS protection is transparent to applications.

Accepted Answer

A) True 
 B)False

Question 16

In cryptographic systems, keying takes place during the second handshaking stage.

Accepted Answer

A) True 
 B)False

Question 17

The 56-bit key size ________.

Accepted Answer

A)  is sufficient for major business transactions 
B)  is sufficient for most residential consumer applications 
C)  is considered a strong length 
D)  All of the above 
A)  is sufficient for major business transactions 
B)  is sufficient for most residential consumer applications 
C)  is considered a strong length 
D)  All of the above

Question 18

When both parties prove their identities to the other, this is called ________.

Accepted Answer

A)  mutual authentication 
B)  symmetric authentication 
C)  authentication 
D)  dual authentication 
A)  mutual authentication 
B)  symmetric authentication 
C)  authentication 
D)  dual authentication

Question 19

When a hashing algorithm is applied, the hash will ALWAYS have a fixed length.

Accepted Answer

A) True 
 B)False

Question 20

To test the digital signature, the verifier will use sender's public key.

Accepted Answer

A) True 
 B)False

________ thwart replay attacks by ensuring "freshness" using cutoff values.

A ________ is a random string of 40 to 4,000 bits (ones and zeros) used to encrypt messages.

Which of the following statements accurately describes RC4?

The hash size in MD-5 is 160 bits.

________ occurs when companies believe they have good security because they are using proprietary ciphers that hackers do not know.

Cryptanalysts have found weaknesses in ________.

To be strong, keys need to be longer than keys.

Which encryption method does MS-CHAP use?

The most popular public key cipher is RSA.

IPsec operates at the ________ layer.

When Joshua sends a message to Larry, Joshua will use ________ to encrypt the message.

Digital signatures provide ________.

A DES key is ________ bits long.

A DES key is 40 bits long.

SSL/TLS protection is transparent to applications.

In cryptographic systems, keying takes place during the second handshaking stage.

The 56-bit key size ________.

When both parties prove their identities to the other, this is called ________.

When a hashing algorithm is applied, the hash will ALWAYS have a fixed length.

To test the digital signature, the verifier will use sender's public key.

The Threat Environment

Planning and Policy

Secure Networks

Access Control

Firewalls

Host Hardening

Application Security

Data Protection

Incident and Disaster Response

Module A: Networking Concepts

Filters

Exam 3: Cryptography

________ thwart replay attacks by ensuring "freshness" using cutoff values.

A ________ is a random string of 40 to 4,000 bits (ones and zeros) used to encrypt messages.

Which of the following statements accurately describes RC4?

The hash size in MD-5 is 160 bits.

________ occurs when companies believe they have good security because they are using proprietary ciphers that hackers do not know.

Cryptanalysts have found weaknesses in ________.

To be strong, ________ keys need to be longer than ________ keys.

Which encryption method does MS-CHAP use?

The most popular public key cipher is RSA.

IPsec operates at the ________ layer.

When Joshua sends a message to Larry, Joshua will use ________ to encrypt the message.

Digital signatures provide ________.

A DES key is ________ bits long.

A DES key is 40 bits long.

SSL/TLS protection is transparent to applications.

In cryptographic systems, keying takes place during the second handshaking stage.

The 56-bit key size ________.

When both parties prove their identities to the other, this is called ________.

When a hashing algorithm is applied, the hash will ALWAYS have a fixed length.

To test the digital signature, the verifier will use sender's public key.

The Threat Environment

Planning and Policy

Secure Networks

Access Control

Firewalls

Host Hardening

Application Security

Data Protection

Incident and Disaster Response

Module A: Networking Concepts

Filters

To be strong, keys need to be longer than keys.