Question 1

In a replay attack, the attacker cannot read the contents of the replayed message.

Accepted Answer

A) True 
 B)False  True

Question 2

In public key encryption, "signing" is the act of ________.

Accepted Answer

A)  adding the password to the challenge message and hashing the two 
B)  hashing the plain text message 
C)  encrypting the message digest with its own private key 
D)  encrypting the message digest with its own public key 
A)  adding the password to the challenge message and hashing the two 
B)  hashing the plain text message 
C)  encrypting the message digest with its own private key 
D)  encrypting the message digest with its own public key C

Question 3

DES uses block encryption.

Accepted Answer

A) True 
 B)False  True

Question 4

To ensure that a digital certificate is valid, the receiver of the certificate must check ________.

Accepted Answer

A)  the digital signature 
B)  the valid period 
C)  whether the certificate has been revoked 
D)  All of the above. 
A)  the digital signature 
B)  the valid period 
C)  whether the certificate has been revoked 
D)  All of the above.

Question 5

Someone who pretends to be someone else is ________.

Accepted Answer

A)  a social engineer 
B)  a hacker 
C)  a cryptanalyst 
D)  an impostor 
A)  a social engineer 
B)  a hacker 
C)  a cryptanalyst 
D)  an impostor

Question 6

Signing a message digest means encrypting it with the sender's public key.

Accepted Answer

A) True 
 B)False

Question 7

________ is the security guarantee that people who intercept messages cannot read them.

Accepted Answer

A)  Integrity 
B)  Availability 
C)  Confidentiality 
D)  Encryption 
A)  Integrity 
B)  Availability 
C)  Confidentiality 
D)  Encryption

Question 8

Quantum key cracking ________.

Accepted Answer

A)  is a way to deliver enormously long keys to communication partners 
B)  creates a major threat to many traditional cryptographic methods 
C)  Both A and B 
D)  Neither A nor B 
A)  is a way to deliver enormously long keys to communication partners 
B)  creates a major threat to many traditional cryptographic methods 
C)  Both A and B 
D)  Neither A nor B

Question 9

In public key encryption for authentication, the verifier decrypts the ciphertext with the supplicant's public key.

Accepted Answer

A) True 
 B)False

Question 10

The supplicant creates a digital signature by ________.

Accepted Answer

A)  adding the password to the challenge message and hashing the two 
B)  hashing the plain text message 
C)  encrypting the message digest with its own private key 
D)  encrypting the message digest with its own public key 
A)  adding the password to the challenge message and hashing the two 
B)  hashing the plain text message 
C)  encrypting the message digest with its own private key 
D)  encrypting the message digest with its own public key

Question 11

What usually is the longest stage in a cryptographic system dialogue?

Accepted Answer

A)  Ongoing communication 
B)  Negotiation of security methods and parameters 
C)  Keying 
D)  Mutual authentication 
A)  Ongoing communication 
B)  Negotiation of security methods and parameters 
C)  Keying 
D)  Mutual authentication

Question 12

Which of the following is one of the effective key lengths in 3DES?

Accepted Answer

A)  40 bits 
B)  110 bits 
C)  Both A and B 
D)  Neither A nor B 
A)  40 bits 
B)  110 bits 
C)  Both A and B 
D)  Neither A nor B

Question 13

In authentication, the party trying to provide its identity to the other party is called the applicant.

Accepted Answer

A) True 
 B)False

Question 14

In codes, code symbols may represent ________.

Accepted Answer

A)  complete words 
B)  complete phrases 
C)  individual letters 
D)  All of the above 
A)  complete words 
B)  complete phrases 
C)  individual letters 
D)  All of the above

Question 15

Strong RSA keys are at least ________ bits long.

Accepted Answer

A)  100 
B)  256 
C)  512 
D)  1,024 
A)  100 
B)  256 
C)  512 
D)  1,024

Question 16

Which of the following can be used as a keying method?

Accepted Answer

A)  Public key encryption for confidentiality 
B)  MS-CHAP 
C)  Both A and B 
D)  None of the above 
A)  Public key encryption for confidentiality 
B)  MS-CHAP 
C)  Both A and B 
D)  None of the above

Question 17

Which types of VPNs use VPN gateways?

Accepted Answer

A)  Host-to-host VPNs 
B)  Remote access VPNs 
C)  Both A and B 
D)  Neither A nor B 
A)  Host-to-host VPNs 
B)  Remote access VPNs 
C)  Both A and B 
D)  Neither A nor B

Question 18

If a key is 43 bits long, how much longer will it take to crack it by exhaustive search if it is extended to 50 bits?

Accepted Answer

A)  7 times as long 
B)  14 times as long 
C)  128 times as long 
D)  256 times as long 
A)  7 times as long 
B)  14 times as long 
C)  128 times as long 
D)  256 times as long

Question 19

Public key encryption is ________.

Accepted Answer

A)  complex 
B)  slow 
C)  expensive 
D)  All of the above 
A)  complex 
B)  slow 
C)  expensive 
D)  All of the above

Question 20

Nearly all encryption for confidentiality uses symmetric key encryption ciphers.

Accepted Answer

A) True 
 B)False

In a replay attack, the attacker cannot read the contents of the replayed message.

In public key encryption, "signing" is the act of ________.

DES uses block encryption.

To ensure that a digital certificate is valid, the receiver of the certificate must check ________.

Someone who pretends to be someone else is ________.

Signing a message digest means encrypting it with the sender's public key.

________ is the security guarantee that people who intercept messages cannot read them.

Quantum key cracking ________.

In public key encryption for authentication, the verifier decrypts the ciphertext with the supplicant's public key.

The supplicant creates a digital signature by ________.

What usually is the longest stage in a cryptographic system dialogue?

Which of the following is one of the effective key lengths in 3DES?

In authentication, the party trying to provide its identity to the other party is called the applicant.

In codes, code symbols may represent ________.

Strong RSA keys are at least ________ bits long.

Which of the following can be used as a keying method?

Which types of VPNs use VPN gateways?

If a key is 43 bits long, how much longer will it take to crack it by exhaustive search if it is extended to 50 bits?

Public key encryption is ________.

Nearly all encryption for confidentiality uses symmetric key encryption ciphers.

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

In a replay attack, the attacker cannot read the contents of the replayed message.

In public key encryption, "signing" is the act of ________.

DES uses block encryption.

To ensure that a digital certificate is valid, the receiver of the certificate must check ________.

Someone who pretends to be someone else is ________.

Signing a message digest means encrypting it with the sender's public key.

________ is the security guarantee that people who intercept messages cannot read them.

Quantum key cracking ________.

In public key encryption for authentication, the verifier decrypts the ciphertext with the supplicant's public key.

The supplicant creates a digital signature by ________.

What usually is the longest stage in a cryptographic system dialogue?

Which of the following is one of the effective key lengths in 3DES?

In authentication, the party trying to provide its identity to the other party is called the applicant.

In codes, code symbols may represent ________.

Strong RSA keys are at least ________ bits long.

Which of the following can be used as a keying method?

Which types of VPNs use VPN gateways?

If a key is 43 bits long, how much longer will it take to crack it by exhaustive search if it is extended to 50 bits?

Public key encryption is ________.

Nearly all encryption for confidentiality uses symmetric key encryption ciphers.

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