Deck 7: Encryption Controls

Question 1

Public Key cryptography refers to

A) The use of the same key for both encryption and decryption
B) The use of a secret algorithm for encryption and decryption
C) The use of a secret key only decryption
D) The use of a secret key for encryption

Answer 1

C

Question 2

Electronic Code Book ECB is not used for encryption since it has inadequate

A) Licensing flexibility
B) Recovery features
C) Diffusion of confusion
D) Parallelism

Answer 2

Diffusion of confusion

Question 3

Ciphertext is

A) The transformation of data to produce ciphertext
B) Text that is unintelligible to the reader
C) A sequence of symbols that controls the operations of encipherment and decipherment
D) A well-defined sequence of steps used to describe cryptographic processes
E) An encryption method that uses no keys

Answer 3

B

Question 4

Encryption is

A) The transformation of data to produce ciphertext
B) Text that is unintelligible to the reader
C) A sequence of symbols that controls the operations of encipherment and decipherment
D) A well-defined sequence of steps used to describe cryptographic processes
E) An encryption method that uses no keys

Question 5

The current standard for secret key encryption is

A) DES Data Encryption Standard
B) AES Advanced Encryption Standard
C) IDEA International Data Encryption Algorithm
D) SHA Secure Hash Algorithm

Question 6

Public key encryption techniques used in practice are based heavily on

A) Division operations
B) Set operations
C) Extraction operations
D) Modulus operations

Question 7

Digital signatures are

A) The transformation of data to produce ciphertext
B) The use of cryptography that allows a user to prove the source and integrity of data
C) Text that is unintelligible to the reader
D) A sequence of symbols that controls the operations of encipherment and decipherment

Question 8

Block encryption uses both

A) Relational and Procedural operations
B) Substitution and permutation
C) Keys and hashes
D) Data and storage

Question 9

The word Cipher is based on an Arabic word, cifr, that means

A) Sender
B) Secret
C) Nothing
D) Receiver

Question 10

Cryptanalysis is

A) The art of breaking ciphertext
B) The transformation of data to produce ciphertext
C) The science of creating superior encryption algorithms
D) Text that is unintelligible to the reader

Question 11

Hash functions are used primarily for

A) Sharing a secret key prior to network transmission
B) Storing data on hard drives
C) Encrypting data during transmission over a network
D) Saving passwords

Question 12

In the context of encryption, a key is

A) A well-defined sequence of steps used to describe cryptographic processes
B) An encryption method that uses no keys
C) A sequence of symbols that controls the operations of encipherment and decipherment
D) Text that is unintelligible to the reader

Question 13

In using public key encryption, messages are deciphered using

A) A public key
B) A shared secret key
C) Any key
D) A private key

Question 14

Desirable properties In good encryption algorithms include

A) Generating characters that appear random
B) Generating output that appears to be of random length
C) Changing at least half the bits in the output when even one bit changes in the input
D) All the above

Question 15

Claude Shannon developed the framework for secrecy known as

A) Confusion diffusion
B) 4P model
C) 4C model
D) Inversion of control

Question 16

The first documented instance of encryption was used by

A) Egyptian pharaoh Tutankhamun
B) Italian inventor Leonardo da Vinci
C) Italian artist Michelangelo
D) Roman Emperor Julius Caesar

Question 17

Hash functions use

A) 2 keys
B) 1 key
C) 0 keys
D) Any of the above, depending upon the specific hash algorithm

Question 18

A cryptographic algorithm is

A) Symbols that controls encipherment and decipherment
B) A well-defined sequence of steps used to describe cryptographic processes
C) An encryption method that uses no keys
D) Text that is unintelligible to the reader

Question 19

Secret key cryptography refers to

A) The use of the same key for both encryption and decryption
B) The use of a secret algorithm for encryption and decryption
C) The use of a secret key only for decryption
D) The use of a secret key for encryption

Question 20

Public key encryption is used primarily for

A) Sharing a secret key prior to network transmission
B) Storing data on hard drives
C) Encrypting data during transmission over a network
D) Saving passwords

Question 21

The popular encryption method RSA is an example of

A) Secret key encryption
B) Public key encryption
C) Hash functions
D) AES

Question 22

A certificate used in web applications contains the

A) Shared secret key prior to network transmission
B) The hash output of the data to be transmitted
C) Saved password of the end user for recovery
D) Public key of the server and information about the key provider

Question 23

For any given input, the length of its hash out is

A) Always shorter than the input
B) Depends upon the length of the input
C) Always the same
D) Always longer than the input

Question 24

The most common technologies used for secure network communication are

A) VPN and SSL
B) AES and DES
C) PKI and RSA
D) Diffusion and confusion