symmetirc key encryption

Question 1

_____ encryption uses only one key to encrypt and decrypt data

Answer 1

symmetric

Question 2

this symmetric key distribution method involves manually distributing the key

Answer 2

out-of-band distribution

Question 3

this symmetric key distribution method uses a distribution algorithm and asymmetric technology to encrypt the key for distribution

Answer 3

in-band distribution

Question 4

symmetric encryption uses which two algorithms

Answer 4

block and stream cipher

Question 5

which symmetric algorithm encrypts by transporting plain text to cipher text in chunks

Answer 5

block cipher

Question 6

which symmetric algorithm uses a sequence of bits for encryption

Answer 6

stream cipher

Question 7

this symmetric crypto method uses a variable key size block cipher which was designed to replace DES.

Answer 7

RC2

Question 8

this symmetric crypto method uses a secret key cryptographic algorithm

Answer 8

RC5

Question 9

this symmetric crypto method was created by NSA

Answer 9

data encryption standard (DES) and

SkipJck

Question 10

RC5 supports ___ bit blocks

Answer 10

32, 64, and 128

Question 11

this symmetric crypto method is an enhanced version of DES

Answer 11

triple data encryption standard (3DES)

Question 12

this symmetric crypto method uses a 168 bit key

Answer 12

triple data encryption standard (3DES)

Question 13

this symmetric crypto method is iterative

Answer 13

advanced encryption standard (AES)

Question 14

advanced encryption standard (AES) supports _____ bit keys

Answer 14

128, 192, 256

Question 15

this symmetric crypto method uses block cipher and was intended to be free of problems associated with other algorithms

Answer 15

blowfish

Question 16

this symmetric crypto method permits tradeoffs

Answer 16

twofish

Question 17

this strengthens weak encryption keys

Answer 17

key stretching

Question 18

it embeds a symmetric key into a message before the message is hashed

Answer 18

keyed-hash message authentication code (HMAC)

Question 19

RC2 supports __ bit blocks

Answer 19

64

Question 20

RC2 uses _____ to modify a password hash by using a random string of data to prohibit password hash matching types of attacks.

Answer 20

salt

Question 21

DES uses a __ bit key and ___ bit parity for encryption

Answer 21

56

8

Question 22

3DES uses a ____ bit key

Answer 22

168

Question 23

blowfish uses ___ bit blocks and supports key lengths of

Answer 23

64

32 - 448 bits

Question 24

twofish supports _____ bit keys and supports variable key lengths of

Answer 24

128

128, 192, 256