Week 3 Practice Quiz

Question 1

The CBC mode, the current plaintext block is added to the previous ciphertext block.

Answer

true

Question 2

The ECB mode require that the length of the plaintext be an exact multiple of the block size of the cipher used.

Answer

true

Question 3

The ECB mode is the most ___________ way of processing a series of sequentially listed message blocks.

Accepted Answer

straightforward

Answer

slow

Answer

fast

Answer

confusing

Question 4

The OFB mode can act as a stream cipher.

Answer

true

Question 5

In the OFB mode, each bit in the ciphertext is independent of the previous bit or bits.

Answer

true

Question 6

In the CTR mode, the counter need not be synchronous for the sender and receiver.

Answer

true

Question 7

One of the goals of the the public-key (asymmetric) is to not have complicated math method between the input and output.

Answer

true

Question 8

PKC depends upon the existence of so-called one-way functions, or mathematical functions that are easy to compute.

Answer

true

Question 9

One of the Public-key cryptography (PKC) algorithms that are in use today for key exchange or digital signatures include:

Accepted Answer

RSA

Answer

CBC

Answer

CTR

Answer

OFC

Question 10

One of the problems with symmetric cryptography is security of the key and the potentially large number of keys that may be needed.

Answer

true

Question 11

The Euclidean algorithm is the foundation of and extremely import to Public-key cryptography.

Answer

true

Question 12

What protocol allows the transport of secret keys or an insecure channel?

Accepted Answer

Diffie-Hellman key exchange

Answer

Greg Kessle

Answer

DSA

Answer

ECDSA

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