Deck 21: Cryptography and Security

Question 1

The power of a particular encryption technique is based on the ____.

A) key length
B) encryption strength
C) storage technique
D) system entropy

Answer 1

B

Question 2

A ____ is visible or invisible information added to an image, video, or audio that identifies the copyright owner of the media.

A) digital signature
B) digital footprint
C) digital fingerprint
D) digital watermark

Answer 2

D

Question 3

The hash value is called a ____.

A) cipher
B) digest
C) ciphertext
D) plaintext

Answer 3

B

Question 4

In ____ encryption, the private key is kept private, in the hands of a single individual.

A) asymmetric
B) symmetric
C) private key
D) shared secret

Question 5

____ ciphers encrypt any number of bits

A) Bit
B) Hash
C) Stream
D) Block

Question 6

Asymmetric encryption algorithms use ____________________ keys to perform the encryption and decryption.

Question 7

The ____ determines the level of data protection provided by the encryption technique.

A) encryption strength
B) storage technique
C) system entropy
D) key length

Question 8

Symmetric encryption is generally thought to be more secure than asymmetric encryption.

Question 9

Keeping secrets has become a major force in networking and communication.

Question 10

Symmetric encryption algorithms use one key for both encryption and decryption.

Question 11

Hashed data can be unhashed and turned back into their original form.

Question 12

In ____ encryption, the single key must be shared between the individuals wishing to protect their data.

A) asymmetric
B) public key
C) symmetric
D) shareable

Question 13

____________________ is a technique to detect changes to information rather than encrypt and decrypt information.

Question 14

____ is a fascinating and possibly dangerous technique for hiding one form of information inside another.

A) Sociology
B) Cryptography
C) Steganography
D) Social analytics

Question 15

The ____________________ of the WAV file determines how much data can be hidden inside it.

Question 16

A JPG image is a complex data structure containing compressed DCT coefficients for ____ blocks of pixels.

A) 4x4
B) 8x8
C) 16x16
D) 32x32

Question 17

In the ____ cipher technique, the letters of the alphabet are shifted one or more positions to obtain the encryption alphabet.

A) Caesar
B) Roman
C) Augustus
D) Romani

Question 18

A(n) ____________________ is a special word, phrase, or binary number that is used during encryption or decryption to manipulate the data.

Question 19

Even the best encryption algorithm can be outdone by improper use.

Question 20

A(n) ____________________ cipher is an algorithm that encrypts or decrypts blocks of data, such as 64-bit or 128-bit chunks of information at a time.

Question 21

How is data hidden inside a WAV?

Question 23

What is a frequency analysis?

Question 24

Describe asymmetric encryption.

Question 25

Describe symmetric encryption.

Question 26

Discuss the encryption strength of symmetric and asymmetric encryption.