9.5

which of the following are true of Triple DES (3DES)?

-uses a 168 bit key -is used in Ipsec

which of the following encryption mechanisms offers the least security because of weak keys?

DES

which of the following is the weakest symmetric encryption method?

DES

which version of the Rivest cipher is a block cipher that supports variable bit length keys and variable bit block sizes?

RC5

which of the following is the most frequently used symmetric key stream cipher?

ROn's cipher v4 (RC4)

which of the following can be classified as a stream cipher?

RC4

what type of key or keys are used in symmetric cryptography?

a shared private key

you want to encrypt data on a removable storage device. which encryption method would you choose to use the strongest method possible?

AES

which of the following symmetric cryptography systems does not support a variable block size?

IDEA

which of the following is considered an out-of-band distribution method for private key encryption?

copying the key to a USB drive

the sender's key is sent to a recipient using a Diffie-Hellman key exchange

in-band distribution

the sender's key is sent to the recipient using public key cryptography

in-band distribution

which of the following block ciphers does not use a variable block length?

international data encryption algorithm (IDEA)

how many keys are used with symmetric key cryptography?

one

the sender's key is burned to a CD and handed to the recipient

out-of-band distribution

the sender's key is copied to a USB drive and handed to the recipient

out-of-band distribution

what form of cryptography is best suited for bulk encryption because it is so fast?

symmetric key cryptography

which of the following forms of cryptography is best implemented in hardware?

symmetric stream