Chapter 5

Question 1

On what principle did Julius Caesar’s cyptographic messages function?

Question options:

Each alphabetic letter was replaced by a corresponding number

Each alphabetic letter was represented by a seemingly random symbol

Each alphabetic letter was shifted three places down in the alphabet

Each alphabetic letter was shifted 5 places up in the alphabet.

Answer 1

Each alphabetic letter was shifted three places down in the alphabet

Question 2

Data that is in an unencrypted form is referred to as which of the following?

Question options:

Plaintext

Plain text

Simpletext

Cleartext

Answer 2

Cleartext

Question 3

In cryptography, which of the five basic protections ensures that the information is correct and no unauthorized person or malicious software has altered that data?

Question options:

Confidentiality

Availability

Encryption

Integrity

Answer 3

Integrity

Question 4

What type of cryptographic algorithm is considered to be a one-way algorithm, in that its content can't be used to reveal the original set of data?
A) hash
B) key
C) digest
D) block

Answer 4

hash

Question 5

Select below the hashing algorithm that takes plaintext of any length and generates a digest 128 bits in length:

Question options:

RSA

SHA1

MD5

MD2

Answer 5

MD2

Question 6

If using the MD5 hashing algorithm, what is the length to which each message is padded?

Question options:

32 bits

64 bits

128 bits

512 bits

Answer 6

512 bits

Question 7

What is the name of the cryptographic hash function that has international recognition and has been adopted by standards organizations such as the ISO, that creates a digest of 512 bits and will not be subject to patents?

Question options:

Twofish

Blowfish

Whirlpool

Rijndal

Answer 7

Whirlpool

Question 8

In which type of encryption is the same key used to encrypt and decrypt data?
A) private
B) public
C) symmetric
D) asymmetric

Answer 8

A) private

Question 9

The simplest type of stream cipher, one in which one letter or character is exchanged for another, is known as what?

Question options:

shift

substitution

lock

loop

Answer 9

substitution

Question 10

Which type of cryptographic algorithm takes an input string of any length, and returns a string of any requested variable length?

Question options:

Substitution

Block

Loop

Sponge

Answer 10

Sponge

Question 11

After the DES cipher was broken and no longer considered secure, what encryption algorithm was made as its successor?

Question options:

AES

Twofish

3DES

RSA

Answer 11

3DES

Question 12

Select below the standard that is based on the Rijndael algorithm, and was approved by NIST in late 2000 as a replacement for DES:
A) AES
B) 3DES
C) RSA
D) Twofish

Answer 12

AES

Question 13

What is the block cipher algorithm that operates on 64-bit blocks and can have a key length from 32 to 448 bits known as?

Question options:

RSA

AES

Blowfish

3DES

Answer 13

Blowfish

Question 14

What type of cryptography uses two keys instead of just one, generating both a private and a public key?

Question options:

Symmetric

Asymmetric

Shared

Open

Answer 14

Asymmetric

Question 15

Which of the following is not one of the functions of a digital signature?

Question options:

Verification of the sender

Prevention of the sender from disowning the message

Prove the integrity of the message

Protect the public key

Answer 15

Protect the public key

Question 16

The asymmetric cryptography algorithm most commonly used is:

Question options:

AES

RSA

Twofish

Blowfish

Answer 16

RSA

Question 17

What cryptographic method, first proposed in the mid-1980s, makes use of sloping curves instead of large prime numbers?

Question options:

FCC

RSA

ECC

IKE

Answer 17

ECC

Question 18

Cryptography that attempts to use the microscopic behaviors of objects to develop and share keys while also detecting eavesdropping is known as what type of cryptography?

Question options:

Reactive cryptography

Symmetric cryptography

Analog cryptography

Quantum cryptography

Answer 18

Quantum cryptography

Question 19

The NTRUEncrypt cryptographic algorithm makes use of which of the following cryptographic techniques?

Question options:

matrix-based

lattice-based

linear

quantum

Answer 19

lattice-based

Question 20

What is the name of the open source asymmetric cryptography system that runs on Windows, UNIX, and Linux systems, and is compatible with PGP?
A) GPG
B) OGP
C) CGP
D) GPP

Answer 20

A) GPG

Question 21

The SHA-1 hashing algorithm creates a digest that is how many bits in length?

Question options:

​96 bits

​128 bits

​160 bits

​192 bits

Answer 21

​160 bits