Practice Test Questions

Question 1

Which key is used to sign a message or a message digest?

Answer 1

Senders Private Key

Question 2

What needs to be installed on end users computers to allow them to trust applications that have been digitally signed by the developer?

Answer 2

Senders Public Key

Question 3

Which Key does the CA use to digitally sign keys that it issues

Answer 3

Servers Private Key

Question 4

What does an end user need to verify a RSA digitally signed message?

Answer 4

Sender’s Public Key

Question 5

What is used when creating a digital signature, using PKI

Answer 5

The private key of the person creating the message.

Question 6

Which extension designates a file containing a password-protected private key?

Answer 6

.P12

Question 7

Which part of the PKI defines how a credential is used?

Answer 7

Certificate Policy

Question 8

Which feature in WEP provides integrity control when sending packets overt a wireless network?

Answer 8

Cyclic redundancy check

Question 9

choose 2

Which two concerns does the use of Counter Mode with Cipher Block Chaining Message Authentication Code Protocol (CCMP) address?

Answer 9

Confidentiality

Integrity

Question 10

Which network-based Virtual private network prevents unauthorized logins by preventing packet retransmissions?

Answer 10

IPSec

Question 11

Which Port does secure socket tunneling protocol (SSTP) use?

Answer 11

443

Question 12

What is an attribute of the Rivset Cipher 4 algorithm?

Answer 12

Requires a unique Nonce

Question 13

Which mode is a stream algorithm that concatenates an incrementing value with a nonce?

Answer 13

Output Feedback(OFB)

Question 14

Which mode produces the same ciphertext from two identical plaintext blocks?

Answer 14

Electronic Codebook (ECB)

Question 15

What Encryption mode is least secure?

Answer 15

Electronic Codebook(ECB)

Question 16

Which encryption process minimizes known plaintext attacks against AES?

Answer 16

Randomizing the initializing vector

Question 17

Which factor increases the required number of attempts in a brute-force-attack?

Answer 17

Larger Key Size

Question 18

Which Block size does AES use?

Answer 18

128

Question 19

What is the mathematical formula used for symmetric decryption?

Answer 19

P=E(K,C)

Question 20

Which cryptographic algorithm has a 128-bit hash size?

Answer 20

MD5

Question 21

Which hashing function produces a 160-bit output value?

Answer 21

SHA-1

Question 22

What is the result of A|B and B|C?

Answer 22

A|C

Question 23

How is X mod N if N = PQ represented in number theory?

Answer 23

( X mod P, X mod Q)

Question 24

Which type of cipher converts a letter to a number passes it through a mathematical function and then converts it back?

Answer 24

Affine

Question 25

Which technique solves polyalphabetic substitution ciphers by deducing the key length?

Answer 25

Kasiki’s Method

Question 26

Which technique does related-key cryptanalysis use to decipher a message?

Answer 26

Messages are encrypted using different secrets and the analyst compares the messages to figure out how the algorithm works.