Question: Which key is used to decrypt a hash in a digitally signed message?

Answer Choices:

Recipient’s private key
Sender’s private key
Sender’s public key
Recipient’s public key

Answer: Sender’s public key

 

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Question: Which component is used to verify that a data entity was created?

Answer Choices:

TSP
AES
NTLM
HMAC

Answer: TSP

 

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Question: Which mode of encryption uses an initialization vector (IV) for the first part of plaintext and then, to encrypt each subsequent part of plaintext, leverages the outcome from each preceding operation?

Answer Choices:

CFB
CBC
ECB
OFB

Answer: CBC

 

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Question: Which type of encryption uses CFB mode?

Answer Choices:

Stream
Hash
Salt
Block

Answer: Stream

 

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Question: How does ECB mode encryption function?

Answer Choices:

Converts from block to stream, then uses a counter value and a nonce to encrypt the data
Uses an initialization vector (IV) to encrypt the first block, then uses the result of the encryption to encrypt the next block
Encrypts each block with the same key, where each block is independent of the others
Uses a self-synchronizing stream on the blocks, where the initialization vector (IV) is encrypted and XORed with the data stream

Answer: Encrypts each block with the same key, where each block is independent of the others Question

 

Question: A security analyst is using human interactions as data points to generate numbers for a program. Which type of number generator is being used?

Answer Choices:

Prime
True random
Pseudorandom
Sequence

Answer: True random Question

 

Question: Which secret key algorithm is used in the Clipper chip?

Answer Choices:

Blowfish
Skipjack
IDEA
DES

Answer: Skipjack Question

 

Question: Which encryption algorithm uses an 80-bit key and operates on 64-bit data blocks?

Answer Choices:

Twofish
Camellia
Blowfish
Skipjack

Answer: Skipjack Question

 

Question: What is the maximum key size of the Blowfish cipher?

Answer Choices:

128
192
256
448

Answer: 448

 

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Question: What is the correlation between a block algorithm key size and its performance and security?

Answer Choices:

The key size is directly proportional to security, but performance is unaffected
As the key size increases, performance and security also increase
As the key size increases, performance decreases, and security increases
The key size is directly proportional to performance, but security is unaffected

Answer: As the key size increases, performance decreases, and security increases

 

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Question: Which attack maps hashed values and original data?

Answer Choices:

Rainbow table
Brute-force
Birthday
Dictionary

Answer: Rainbow table

 

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Question: How does a rainbow table crack stored passwords?

Answer Choices:

Matches hash values back to the original plaintext
Takes a list of the most common words and tries each entry
Looks at the mathematical probability of paired values being used
Factors the prime numbers used within an RSA algorithm

Answer: Matches hash values back to the original plaintext

 

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Question: Which cryptographic operation has the fastest decryption process?

Answer Choices:

Asymmetric
Hashing
Padding
Symmetric

Answer: Symmetric

 

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Question: Which cryptographic operation is computationally more process intensive?

Answer Choices:

Padding
Symmetric
Hashing
Asymmetric

Answer: Asymmetric

 

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Question: What should be used when large amounts of data need to be quickly encrypted and decrypted one bit at a time?

Answer Choices:

Asymmetric private key
Symmetric block
Symmetric stream
Asymmetric public key

Answer: Symmetric stream

 

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Question: How does public-key encryption guarantee only the recipient can decrypt an email?

Answer Choices:

The hash of the email is encrypted with the sender’s private key
The payload of the email is encrypted with the recipient’s private key
The payload of the email is encrypted with the recipient’s public key
The hash of the email is encrypted with the sender’s public key

Answer: The payload of the email is encrypted with the recipient’s public key

 

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Question: Which IPsec protocol mechanism encrypts the entire packet and adds new data to the front of the packet?

Answer Choices:

Security Association (SA)
Authentication Header (AH)
Internet Key Exchange (IKE)
Encapsulating Security Payload (ESP)

Answer: Encapsulating Security Payload (ESP)

 

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Question: An organization needs to implement a method for allowing encrypted data to be processed without providing access to the plaintext. Which encryption should be used?

Answer Choices:

Asymmetric
Session
Symmetric
Homomorphic

Answer: Homomorphic

 

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Question: Which encryption process sends a digital certificate with the selected cipher for encrypted communications?

Answer Choices:

Server hello
Integrity check
Forward secrecy
Client hello

Answer: Server hello

 

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Question: A security analyst is using AES for data encryption. Which AES key size is valid?

Answer Choices:

56-bit
112-bit
128-bit
2048-bit

Answer: 128-bit

 

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Question: A server is using RSA for encrypting and protecting the transmission of a session key. Which RSA key size is valid?

Answer Choices:

56-bit
112-bit
128-bit
2048-bit

Answer: 2048-bit

 

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Question: Which number generator has different results given the same input data?

Answer Choices:

Prime
True random
Sequence
Pseudorandom

Answer: True random

 

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Question: How does WEP continue to change ciphertext for duplicate information in each frame?

Answer Choices:

Salt is removed from the data
Temporal Key Integrity Protocol is enabled
Cyclic redundancy check is updated
Initialization vector is incremented

Answer: Initialization vector is incremented

 

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Question: What stores all of its transactions in a blockchain?

Answer Choices:

Exchange
SQL
Oracle
Bitcoin

Answer: Bitcoin

 

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Question: How often are transactions added to a blockchain?

Answer Choices:

Approximately every 10 minutes
Approximately every 30 minutes
Approximately every 1 hour
Approximately every 24 hours

Answer: Approximately every 10 minutes

 

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Question: What is the correlation between the number of blocks in a blockchain and the mining reward in Bitcoin?

Answer Choices:

As the length of a blockchain increases, the mining reward decreases
The length of a blockchain increases over time, but the mining reward remains the same
The length of a blockchain remains the same, but the mining reward increases over time
As the length of a blockchain increases, the mining reward increases

Answer: As the length of a blockchain increases, the mining reward decreases

 

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Question: An old certificate was replaced with a newer version with additional functionality. Which reason should be given in the original certificate’s revocation request?

Answer Choices:

Superseded
Affiliation changed
CA compromised
Key compromised

Answer: Superseded