J04: Encryption (PE)

Question 1

__________ is how information is concealed into a code so that the data is hidden and the true meaning of the information cannot be determined unless you have access to or are familiar with what the key is.

Answer 1

encryption

Question 2

The science of encrypting and encrypting information is called_________.

Answer 2

cryptography

Question 3

In order for encryption to actually work it has to contain a variable, which in encryption is the key.

• True
• False

Answer 3

True

Question 4

Encryption is only able to protect data at rest or stored data. It cannot protect data while in transit.

• True
• False

Answer 4

False

Question 5

This principle is ensuring sensitive information remains private unless given to another with explicit consent.

• Authentication
• Integrity
• Confidentiality
• Non repudiation

Answer 5

Confidentiality ?

Question 6

This is used to verify the origin of the message.

• Authentication
• Integrity
• Confidentiality
• Non repudiation

Answer 6

Authentication

Question 7

This is used to prove the contents of a message have not been changed since it was sent.

• Authentication
• Integrity
• Confidentiality
• Non repudiation

Answer 7

intergrity

Question 8

What prevents the sender from denying they sent an encrypted message?

Answer 8

non repudiation

Question 9

What are two different types of keys?

Answer 9

symmetric & asymmetric ?

Question 10

When using Stream Algorithms, set lengths of bits are encrypted in blocks of electronic data with the use of a specific secret key. As the data is being encrypted, the system holds the data in its memory as it waits for complete blocks.

• True
• False

Answer 10

False

Question 11

What are the two main types of Symmetric algorithms?

Format: Algorithm1, Algorithm2

Answer 11

block, steam ?

Question 12

Before the DES process even starts, every 6th bit of the key is discarded to produce a 56-bit key.

• True
• False

Answer 12

False (ever 8th bit)

Question 13

The Blowfish Encryption Algorithm was developed as an alternative for DES. Being asymmetric, it uses a separate key for both encryption and decryption.

• True
• False

Answer 13

True

Question 14

What algorithm is the most widely used encryption standard in use today?

• DES
• Blowfish Algorithm
• AES
• None of the above

Answer 14

AES

Question 15

What algorithm is a block cypher that encrypts data in 64 bit blocks, and utilizes a key size that varies in length?

• Blowfish Algorithm
• DES
• AES
• None of the above

Answer 15

Blowfish Algorithm

Question 16

While MD5 is useful, it is not extremely robust or secure making it good for file verification but not good for things that need to be highly secured.

• True
• False

Answer 16

True

Question 17

Fill in the blank: MD5 hashes are _____ bits in length and show their _____ digit hexadecimal value equivalent.

Answer 17

128, 32

Question 18

Which encryption method does NOT use a symmetric key?

• AES
• RSA
• DES
• Blowfish Algorithm

Answer 18

RSA

Question 19

What type of encryption uses both a private and a public key?

• Asymmetric
• Symmetric
• DES
  
  • None of the above

Answer 19

Asymmetric

Question 20

SSL and TLS utilize what type/s of encryption?

• A combination of asymmetric and symmetric encryption
• Specialized key encryption
• PKI Certificate Encryption
• Mathematically comparable keys

Answer 20

A combination of asymmetric and symmetric encryption

Question 21

When visiting an HTTPS website, your browser establishes an ____________ encrypted connection.

Answer 21

asymmetric

Question 22

When used with wireless LAN, MD5 is vulnerable to password exposure?

• True
• False

Answer 22

True

Question 23

A message digest is encrypted the with sender’s private key, this digest is referred to as a digital signature. The receiver of this message can decrypt it using the receiver’s private key.

• True
• False

Answer 23

False

Question 24

The cryptographic hash function is a 2-way function.

• True
• False

Answer 24

False

Question 25

Symmetric encryption consists of _____ key/s for encryption and decryption

Answer 25

1